diff --git a/.gitignore b/.gitignore
index 8b38e58..c8d945c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,7 @@
 ## Generic ignorable patterns and files
 *~
 debug.txt
+
+## Eclipse project files & directories
+.project
+.settings
diff --git a/moremesecons_adjustable_blinkyplant/depends.txt b/moremesecons_adjustable_blinkyplant/depends.txt
index acaa924..5a7e5e6 100644
--- a/moremesecons_adjustable_blinkyplant/depends.txt
+++ b/moremesecons_adjustable_blinkyplant/depends.txt
@@ -1 +1,3 @@
 mesecons
+moremesecons_utils
+craft_guide?
diff --git a/moremesecons_adjustable_blinkyplant/init.lua b/moremesecons_adjustable_blinkyplant/init.lua
index 0afaaf1..66c5e9d 100644
--- a/moremesecons_adjustable_blinkyplant/init.lua
+++ b/moremesecons_adjustable_blinkyplant/init.lua
@@ -4,7 +4,11 @@ local toggle_timer = function (pos, restart)
 	and not restart then
 		timer:stop()
 	else
-		timer:start(tonumber(minetest.get_meta(pos):get_string("interval")) or 0)
+		local interval = tonumber(minetest.get_meta(pos):get_string("interval")) or 1
+		if interval < moremesecons.setting("adjustable_blinky_plant", "min_interval", 0.5) then
+			interval = moremesecons.setting("adjustable_blinky_plant", "min_interval", 0.5)
+		end
+		timer:start(interval)
 	end
 end
 
@@ -30,7 +34,9 @@ mesecon.register_node("moremesecons_adjustable_blinkyplant:adjustable_blinky_pla
 	},
 	on_timer = on_timer,
 	on_construct = function(pos)
-		minetest.get_meta(pos):set_string("formspec", "field[interval;interval;${interval}]")
+		local meta = minetest.get_meta(pos)
+		meta:set_string("interval", "1")
+		meta:set_string("formspec", "field[interval;interval;${interval}]")
 		toggle_timer(pos, true)
 	end,
 	on_receive_fields = function(pos, _, fields, player)
diff --git a/moremesecons_adjustable_player_detector/depends.txt b/moremesecons_adjustable_player_detector/depends.txt
index acaa924..0ddb4fb 100644
--- a/moremesecons_adjustable_player_detector/depends.txt
+++ b/moremesecons_adjustable_player_detector/depends.txt
@@ -1 +1,2 @@
 mesecons
+craft_guide?
diff --git a/moremesecons_commandblock/depends.txt b/moremesecons_commandblock/depends.txt
index a259a42..5a7e5e6 100644
--- a/moremesecons_commandblock/depends.txt
+++ b/moremesecons_commandblock/depends.txt
@@ -1,2 +1,3 @@
 mesecons
 moremesecons_utils
+craft_guide?
diff --git a/moremesecons_conductor_signalchanger/depends.txt b/moremesecons_conductor_signalchanger/depends.txt
index acaa924..0ddb4fb 100644
--- a/moremesecons_conductor_signalchanger/depends.txt
+++ b/moremesecons_conductor_signalchanger/depends.txt
@@ -1 +1,2 @@
 mesecons
+craft_guide?
diff --git a/moremesecons_dual_delayer/depends.txt b/moremesecons_dual_delayer/depends.txt
index acaa924..0ddb4fb 100644
--- a/moremesecons_dual_delayer/depends.txt
+++ b/moremesecons_dual_delayer/depends.txt
@@ -1 +1,2 @@
 mesecons
+craft_guide?
diff --git a/moremesecons_entity_detector/depends.txt b/moremesecons_entity_detector/depends.txt
index acaa924..0ddb4fb 100644
--- a/moremesecons_entity_detector/depends.txt
+++ b/moremesecons_entity_detector/depends.txt
@@ -1 +1,2 @@
 mesecons
+craft_guide?
diff --git a/moremesecons_igniter/depends.txt b/moremesecons_igniter/depends.txt
index f95ba13..b684a5c 100644
--- a/moremesecons_igniter/depends.txt
+++ b/moremesecons_igniter/depends.txt
@@ -1,2 +1,3 @@
 mesecons
 fire
+craft_guide?
diff --git a/moremesecons_induction_transmitter/depends.txt b/moremesecons_induction_transmitter/depends.txt
new file mode 100644
index 0000000..9e005d0
--- /dev/null
+++ b/moremesecons_induction_transmitter/depends.txt
@@ -0,0 +1,3 @@
+mesecons
+mesecons_torch
+default
diff --git a/moremesecons_induction_transmitter/init.lua b/moremesecons_induction_transmitter/init.lua
new file mode 100644
index 0000000..1ca1ba0
--- /dev/null
+++ b/moremesecons_induction_transmitter/init.lua
@@ -0,0 +1,104 @@
+local function induction_transmitter_get_input_rules(node)
+	-- All horizontal rules, except the output
+	local rules = {
+		{x=-1,y=0,z=0},
+		{x=1,y=0,z=0},
+		{x=0,y=0,z=-1},
+		{x=0,y=0,z=1}
+	}
+	for i, r in ipairs(rules) do
+		if vector.equals(r, minetest.facedir_to_dir(node.param2)) then
+			table.remove(rules, i)
+		end
+	end
+	return rules
+end
+
+local function induction_transmitter_get_output_rules(node)
+	return {vector.multiply(minetest.facedir_to_dir(node.param2), 2)}
+end
+
+local function induction_transmitter_get_virtual_output_rules(node)
+	return {minetest.facedir_to_dir(node.param2)}
+end
+
+local function act(pos, node, state)
+	minetest.swap_node(pos, {name = "moremesecons_induction_transmitter:induction_transmitter_"..state, param2 = node.param2})
+
+	local dir = minetest.facedir_to_dir(node.param2)
+	local target_pos = vector.add(pos, vector.multiply(dir, 2))
+	local target_node = minetest.get_node(target_pos)
+	if mesecon.is_effector(target_node.name) then
+		-- Switch on an aside node, so it sends a signal to the target node
+		local aside_rule = mesecon.effector_get_rules(target_node)[1]
+		if not aside_rule then
+			return
+		end
+		mesecon["receptor_"..state](vector.add(target_pos, aside_rule), {vector.multiply(aside_rule, -1)})
+	elseif mesecon.is_conductor(target_node.name) then
+		-- Switch on the conductor itself
+		mesecon["receptor_"..state](target_pos, mesecon.conductor_get_rules(target_node))
+	end
+end
+
+mesecon.register_node("moremesecons_induction_transmitter:induction_transmitter", {
+	description = "Induction Transmitter",
+	drawtype = "nodebox",
+	paramtype = "light",
+	paramtype2 = "facedir",
+	node_box = {
+		type = "fixed",
+		fixed = {
+			{-0.5, -0.5, 0.125, 0.5, 0.5, 0.5},
+			{-0.375, -0.375, -0.1875, 0.375, 0.375, 0.125},
+			{-0.25, -0.25, -0.5, 0.25, 0.25, -0.1875},
+		}
+	},
+	selection_box = {
+		type = "fixed",
+		fixed = {
+			{-0.5, -0.5, 0.125, 0.5, 0.5, 0.5},
+			{-0.375, -0.375, -0.1875, 0.375, 0.375, 0.125},
+			{-0.25, -0.25, -0.5, 0.25, 0.25, -0.1875},
+		},
+	},
+}, {
+	tiles = {"default_mese_block.png"},
+	groups = {cracky = 3},
+	mesecons = {
+		receptor = {
+			state = mesecon.state.off,
+			rules = induction_transmitter_get_output_rules
+		},
+		effector = {
+			rules = induction_transmitter_get_input_rules,
+			action_on = function(pos, node)
+				act(pos, node, "on")
+			end
+		}
+	}
+}, {
+	light_source = 5,
+	tiles = {"default_mese_block.png^[brighten"},
+	groups = {cracky = 3, not_in_creative_inventory = 1},
+	mesecons = {
+		receptor = {
+			state = mesecon.state.on,
+			rules = induction_transmitter_get_output_rules
+		},
+		effector = {
+			rules = induction_transmitter_get_input_rules,
+			action_off = function(pos, node)
+				act(pos, node, "off")
+			end
+		}
+	}
+})
+
+minetest.register_craft({
+	output = "moremesecons_induction_transmitter:induction_transmitter_off",
+	recipe = {
+		{"default:mese_crystal_fragment", "mesecons_torch:mesecon_torch_on", "default:mese_crystal_fragment"},
+		{"", "default:mese_crystal_fragment", ""}
+	}
+})
diff --git a/moremesecons_injector_controller/depends.txt b/moremesecons_injector_controller/depends.txt
index acaa924..0ddb4fb 100644
--- a/moremesecons_injector_controller/depends.txt
+++ b/moremesecons_injector_controller/depends.txt
@@ -1 +1,2 @@
 mesecons
+craft_guide?
diff --git a/moremesecons_jammer/depends.txt b/moremesecons_jammer/depends.txt
index a259a42..5a7e5e6 100644
--- a/moremesecons_jammer/depends.txt
+++ b/moremesecons_jammer/depends.txt
@@ -1,2 +1,3 @@
 mesecons
 moremesecons_utils
+craft_guide?
diff --git a/moremesecons_luablock/depends.txt b/moremesecons_luablock/depends.txt
index acaa924..a259a42 100644
--- a/moremesecons_luablock/depends.txt
+++ b/moremesecons_luablock/depends.txt
@@ -1 +1,2 @@
 mesecons
+moremesecons_utils
diff --git a/moremesecons_luablock/init.lua b/moremesecons_luablock/init.lua
index b501f41..53242f3 100644
--- a/moremesecons_luablock/init.lua
+++ b/moremesecons_luablock/init.lua
@@ -1,3 +1,39 @@
+local hash_table
+local md5
+local storage
+if minetest.get_mod_storage then
+	md5 = dofile(minetest.get_modpath(minetest.get_current_modname()).."/md5_lua/md5.lua")
+	storage = minetest.get_mod_storage()
+	hash_table = minetest.deserialize(storage:get_string("hash_table")) or {}
+else
+	minetest.log("warning", "[moremesecons_luablock] Your version of Minetest does not provide a mod storage API. The mod storage allows moremesecons_luablock to store md5 checksums, which avoids some potential security breaches.")
+end
+
+local function set_md5(pos, code)
+	if not hash_table then
+		return
+	end
+	vector.set_data_to_pos(hash_table, pos.z,pos.y,pos.x, md5.sum(code))
+	storage:set_string("hash_table", minetest.serialize(hash_table))
+end
+
+local function check_md5(pos, code)
+	if not hash_table then
+		return true
+	end
+	local stored_sum = vector.get_data_from_pos(hash_table, pos.z,pos.y,pos.x)
+	if not stored_sum then
+		-- Legacy
+		set_md5(pos, code)
+		return true
+	end
+	if md5.sum(code) ~= stored_sum then
+		return false
+	end
+	return true
+end
+
+
 local function make_formspec(meta, pos)
 	local code = meta:get_string("code")
 	local errmsg = minetest.formspec_escape(meta:get_string("errmsg"))
@@ -74,6 +110,7 @@ minetest.register_node("moremesecons_luablock:luablock", {
 		end
 
 		meta:set_string("code", fields.code)
+		set_md5(pos, fields.code)
 		make_formspec(meta, pos)
 	end,
 	can_dig = function(pos, player)
@@ -87,6 +124,10 @@ minetest.register_node("moremesecons_luablock:luablock", {
 			if code == "" then
 				return
 			end
+			if not check_md5(npos, code) then
+				minetest.log("warning", "[moremesecons_luablock] Code of LuaBlock at pos "..minetest.pos_to_string(npos).." does not match with its md5 checksum!")
+				return
+			end
 			-- We do absolutely no check there.
 			-- There is no limitation in the number of instruction the LuaBlock can execute
 			-- or the usage it can make of loops.
diff --git a/moremesecons_luablock/md5_lua/.travis.yml b/moremesecons_luablock/md5_lua/.travis.yml
new file mode 100644
index 0000000..90bd434
--- /dev/null
+++ b/moremesecons_luablock/md5_lua/.travis.yml
@@ -0,0 +1,34 @@
+language: python
+sudo: false
+
+env:
+  - LUA="lua=5.1"
+  - LUA="lua=5.2"
+  - LUA="lua=5.3"
+  - LUA="luajit=2.0"
+  - LUA="luajit=2.1"
+
+before_install:
+  - pip install hererocks
+  - hererocks lua_install -r^ --$LUA
+  - export PATH=$PATH:$PWD/lua_install/bin # Add directory with all installed binaries to PATH
+
+install:
+  - luarocks install busted
+  - luarocks install luacov
+  - luarocks install luacov-coveralls
+
+script:
+  - busted --verbose --coverage
+
+after_success:
+  - luacov-coveralls --exclude $TRAVIS_BUILD_DIR/lua_install
+
+branches:
+  except:
+    - gh-pages
+
+notifications:
+  email:
+    on_success: change
+    on_failure: always
diff --git a/moremesecons_luablock/md5_lua/CHANGELOG.md b/moremesecons_luablock/md5_lua/CHANGELOG.md
new file mode 100644
index 0000000..a48c47a
--- /dev/null
+++ b/moremesecons_luablock/md5_lua/CHANGELOG.md
@@ -0,0 +1,5 @@
+
+# 1.1.0
+
+* Fixes error with long strings in Lua 5.1 (@pgimeno)
+* Adds incremental mode (@pgimeno)
diff --git a/moremesecons_luablock/md5_lua/MIT-LICENSE.txt b/moremesecons_luablock/md5_lua/MIT-LICENSE.txt
new file mode 100644
index 0000000..1630e47
--- /dev/null
+++ b/moremesecons_luablock/md5_lua/MIT-LICENSE.txt
@@ -0,0 +1,20 @@
+Copyright (c) 2013 Enrique García Cota + Adam Baldwin + hanzao + Equi 4 Software
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/moremesecons_luablock/md5_lua/README.md b/moremesecons_luablock/md5_lua/README.md
new file mode 100644
index 0000000..391b441
--- /dev/null
+++ b/moremesecons_luablock/md5_lua/README.md
@@ -0,0 +1,55 @@
+md5.lua [![Build Status](https://travis-ci.org/kikito/md5.lua.svg)](https://travis-ci.org/kikito/md5.lua)
+=========================================================================================================
+
+This pure-Lua module computes md5 in Lua 5.1, Lua 5.2 and LuaJIT, using native bit-manipulation libraries when available, and falling back to table-based manipulation of integers in 5.1.
+
+It implements md5.sum and md5.sumhex like the [kernel project md5 package](http://www.keplerproject.org/md5/), but it's done completely in Lua, with no dependencies on other libs or C files.
+
+Usage
+=====
+
+Simple example:
+
+    local md5 = require 'md5'
+
+    local md5_as_data  = md5.sum(message)       -- returns raw bytes
+    local md5_as_hex   = md5.sumhexa(message)   -- returns a hex string
+    local md5_as_hex2  = md5.tohex(md5_as_data) -- returns the same string as md5_as_hex
+
+Incremental example (for computing md5 of streams, or big files which have to be loaded in chunks - new since 1.1.0):
+
+    local m = md5.new()
+    m:update('some bytes')
+    m:update('some more bytes')
+    m:update('etc')
+    return md5.tohex(m:finish())
+
+Credits
+=======
+
+This is a cleanup of an implementation by Adam Baldwin - https://gist.github.com/evilpacket/3647908
+
+Which in turn was a mix of the bitwise lib, http://luaforge.net/projects/bit/ by hanzhao (`abrash_han - at - hotmail.com`),
+and http://equi4.com/md5/md5calc.lua, by Equi 4 Software.
+
+Lua 5.2 and LuaJIT compatibility by [Positive07](https://github.com/kikito/md5.lua/pull/2)
+
+A very important fix and the incremental variant by [pgimeno](https://github.com/kikito/md5.lua/pull/10)
+
+
+License
+=======
+
+This library, as well as all the previous ones in which is based, is released under the MIT license (See license file for details).
+
+Specs
+=====
+
+The specs for this library are implemented with [busted](http://ovinelabs.com/busted/). In order to run them, install busted and then:
+
+    cd path/to/where/the/spec/folder/is
+    busted
+
+
+
+
diff --git a/moremesecons_luablock/md5_lua/md5.lua b/moremesecons_luablock/md5_lua/md5.lua
new file mode 100644
index 0000000..5e73ba6
--- /dev/null
+++ b/moremesecons_luablock/md5_lua/md5.lua
@@ -0,0 +1,396 @@
+local md5 = {
+  _VERSION     = "md5.lua 1.1.0",
+  _DESCRIPTION = "MD5 computation in Lua (5.1-3, LuaJIT)",
+  _URL         = "https://github.com/kikito/md5.lua",
+  _LICENSE     = [[
+    MIT LICENSE
+
+    Copyright (c) 2013 Enrique García Cota + Adam Baldwin + hanzao + Equi 4 Software
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the
+    "Software"), to deal in the Software without restriction, including
+    without limitation the rights to use, copy, modify, merge, publish,
+    distribute, sublicense, and/or sell copies of the Software, and to
+    permit persons to whom the Software is furnished to do so, subject to
+    the following conditions:
+
+    The above copyright notice and this permission notice shall be included
+    in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+  ]]
+}
+
+-- bit lib implementions
+
+local char, byte, format, rep, sub =
+  string.char, string.byte, string.format, string.rep, string.sub
+local bit_or, bit_and, bit_not, bit_xor, bit_rshift, bit_lshift
+
+local ok, bit = pcall(require, 'bit')
+if ok then
+  bit_or, bit_and, bit_not, bit_xor, bit_rshift, bit_lshift = bit.bor, bit.band, bit.bnot, bit.bxor, bit.rshift, bit.lshift
+else
+  ok, bit = pcall(require, 'bit32')
+
+  if ok then
+
+    bit_not = bit.bnot
+
+    local tobit = function(n)
+      return n <= 0x7fffffff and n or -(bit_not(n) + 1)
+    end
+
+    local normalize = function(f)
+      return function(a,b) return tobit(f(tobit(a), tobit(b))) end
+    end
+
+    bit_or, bit_and, bit_xor = normalize(bit.bor), normalize(bit.band), normalize(bit.bxor)
+    bit_rshift, bit_lshift = normalize(bit.rshift), normalize(bit.lshift)
+
+  else
+
+    local function tbl2number(tbl)
+      local result = 0
+      local power = 1
+      for i = 1, #tbl do
+        result = result + tbl[i] * power
+        power = power * 2
+      end
+      return result
+    end
+
+    local function expand(t1, t2)
+      local big, small = t1, t2
+      if(#big < #small) then
+        big, small = small, big
+      end
+      -- expand small
+      for i = #small + 1, #big do
+        small[i] = 0
+      end
+    end
+
+    local to_bits -- needs to be declared before bit_not
+
+    bit_not = function(n)
+      local tbl = to_bits(n)
+      local size = math.max(#tbl, 32)
+      for i = 1, size do
+        if(tbl[i] == 1) then
+          tbl[i] = 0
+        else
+          tbl[i] = 1
+        end
+      end
+      return tbl2number(tbl)
+    end
+
+    -- defined as local above
+    to_bits = function (n)
+      if(n < 0) then
+        -- negative
+        return to_bits(bit_not(math.abs(n)) + 1)
+      end
+      -- to bits table
+      local tbl = {}
+      local cnt = 1
+      local last
+      while n > 0 do
+        last      = n % 2
+        tbl[cnt]  = last
+        n         = (n-last)/2
+        cnt       = cnt + 1
+      end
+
+      return tbl
+    end
+
+    bit_or = function(m, n)
+      local tbl_m = to_bits(m)
+      local tbl_n = to_bits(n)
+      expand(tbl_m, tbl_n)
+
+      local tbl = {}
+      for i = 1, #tbl_m do
+        if(tbl_m[i]== 0 and tbl_n[i] == 0) then
+          tbl[i] = 0
+        else
+          tbl[i] = 1
+        end
+      end
+
+      return tbl2number(tbl)
+    end
+
+    bit_and = function(m, n)
+      local tbl_m = to_bits(m)
+      local tbl_n = to_bits(n)
+      expand(tbl_m, tbl_n)
+
+      local tbl = {}
+      for i = 1, #tbl_m do
+        if(tbl_m[i]== 0 or tbl_n[i] == 0) then
+          tbl[i] = 0
+        else
+          tbl[i] = 1
+        end
+      end
+
+      return tbl2number(tbl)
+    end
+
+    bit_xor = function(m, n)
+      local tbl_m = to_bits(m)
+      local tbl_n = to_bits(n)
+      expand(tbl_m, tbl_n)
+
+      local tbl = {}
+      for i = 1, #tbl_m do
+        if(tbl_m[i] ~= tbl_n[i]) then
+          tbl[i] = 1
+        else
+          tbl[i] = 0
+        end
+      end
+
+      return tbl2number(tbl)
+    end
+
+    bit_rshift = function(n, bits)
+      local high_bit = 0
+      if(n < 0) then
+        -- negative
+        n = bit_not(math.abs(n)) + 1
+        high_bit = 0x80000000
+      end
+
+      local floor = math.floor
+
+      for i=1, bits do
+        n = n/2
+        n = bit_or(floor(n), high_bit)
+      end
+      return floor(n)
+    end
+
+    bit_lshift = function(n, bits)
+      if(n < 0) then
+        -- negative
+        n = bit_not(math.abs(n)) + 1
+      end
+
+      for i=1, bits do
+        n = n*2
+      end
+      return bit_and(n, 0xFFFFFFFF)
+    end
+  end
+end
+
+-- convert little-endian 32-bit int to a 4-char string
+local function lei2str(i)
+  local f=function (s) return char( bit_and( bit_rshift(i, s), 255)) end
+  return f(0)..f(8)..f(16)..f(24)
+end
+
+-- convert raw string to big-endian int
+local function str2bei(s)
+  local v=0
+  for i=1, #s do
+    v = v * 256 + byte(s, i)
+  end
+  return v
+end
+
+-- convert raw string to little-endian int
+local function str2lei(s)
+  local v=0
+  for i = #s,1,-1 do
+    v = v*256 + byte(s, i)
+  end
+  return v
+end
+
+-- cut up a string in little-endian ints of given size
+local function cut_le_str(s,...)
+  local o, r = 1, {}
+  local args = {...}
+  for i=1, #args do
+    table.insert(r, str2lei(sub(s, o, o + args[i] - 1)))
+    o = o + args[i]
+  end
+  return r
+end
+
+local swap = function (w) return str2bei(lei2str(w)) end
+
+-- An MD5 mplementation in Lua, requires bitlib (hacked to use LuaBit from above, ugh)
+-- 10/02/2001 jcw@equi4.com
+
+local CONSTS = {
+  0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
+  0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
+  0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
+  0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
+  0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
+  0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
+  0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
+  0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
+  0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
+  0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
+  0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
+  0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
+  0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
+  0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
+  0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
+  0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
+  0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476
+}
+
+local f=function (x,y,z) return bit_or(bit_and(x,y),bit_and(-x-1,z)) end
+local g=function (x,y,z) return bit_or(bit_and(x,z),bit_and(y,-z-1)) end
+local h=function (x,y,z) return bit_xor(x,bit_xor(y,z)) end
+local i=function (x,y,z) return bit_xor(y,bit_or(x,-z-1)) end
+local z=function (ff,a,b,c,d,x,s,ac)
+  a=bit_and(a+ff(b,c,d)+x+ac,0xFFFFFFFF)
+  -- be *very* careful that left shift does not cause rounding!
+  return bit_or(bit_lshift(bit_and(a,bit_rshift(0xFFFFFFFF,s)),s),bit_rshift(a,32-s))+b
+end
+
+local function transform(A,B,C,D,X)
+  local a,b,c,d=A,B,C,D
+  local t=CONSTS
+
+  a=z(f,a,b,c,d,X[ 0], 7,t[ 1])
+  d=z(f,d,a,b,c,X[ 1],12,t[ 2])
+  c=z(f,c,d,a,b,X[ 2],17,t[ 3])
+  b=z(f,b,c,d,a,X[ 3],22,t[ 4])
+  a=z(f,a,b,c,d,X[ 4], 7,t[ 5])
+  d=z(f,d,a,b,c,X[ 5],12,t[ 6])
+  c=z(f,c,d,a,b,X[ 6],17,t[ 7])
+  b=z(f,b,c,d,a,X[ 7],22,t[ 8])
+  a=z(f,a,b,c,d,X[ 8], 7,t[ 9])
+  d=z(f,d,a,b,c,X[ 9],12,t[10])
+  c=z(f,c,d,a,b,X[10],17,t[11])
+  b=z(f,b,c,d,a,X[11],22,t[12])
+  a=z(f,a,b,c,d,X[12], 7,t[13])
+  d=z(f,d,a,b,c,X[13],12,t[14])
+  c=z(f,c,d,a,b,X[14],17,t[15])
+  b=z(f,b,c,d,a,X[15],22,t[16])
+
+  a=z(g,a,b,c,d,X[ 1], 5,t[17])
+  d=z(g,d,a,b,c,X[ 6], 9,t[18])
+  c=z(g,c,d,a,b,X[11],14,t[19])
+  b=z(g,b,c,d,a,X[ 0],20,t[20])
+  a=z(g,a,b,c,d,X[ 5], 5,t[21])
+  d=z(g,d,a,b,c,X[10], 9,t[22])
+  c=z(g,c,d,a,b,X[15],14,t[23])
+  b=z(g,b,c,d,a,X[ 4],20,t[24])
+  a=z(g,a,b,c,d,X[ 9], 5,t[25])
+  d=z(g,d,a,b,c,X[14], 9,t[26])
+  c=z(g,c,d,a,b,X[ 3],14,t[27])
+  b=z(g,b,c,d,a,X[ 8],20,t[28])
+  a=z(g,a,b,c,d,X[13], 5,t[29])
+  d=z(g,d,a,b,c,X[ 2], 9,t[30])
+  c=z(g,c,d,a,b,X[ 7],14,t[31])
+  b=z(g,b,c,d,a,X[12],20,t[32])
+
+  a=z(h,a,b,c,d,X[ 5], 4,t[33])
+  d=z(h,d,a,b,c,X[ 8],11,t[34])
+  c=z(h,c,d,a,b,X[11],16,t[35])
+  b=z(h,b,c,d,a,X[14],23,t[36])
+  a=z(h,a,b,c,d,X[ 1], 4,t[37])
+  d=z(h,d,a,b,c,X[ 4],11,t[38])
+  c=z(h,c,d,a,b,X[ 7],16,t[39])
+  b=z(h,b,c,d,a,X[10],23,t[40])
+  a=z(h,a,b,c,d,X[13], 4,t[41])
+  d=z(h,d,a,b,c,X[ 0],11,t[42])
+  c=z(h,c,d,a,b,X[ 3],16,t[43])
+  b=z(h,b,c,d,a,X[ 6],23,t[44])
+  a=z(h,a,b,c,d,X[ 9], 4,t[45])
+  d=z(h,d,a,b,c,X[12],11,t[46])
+  c=z(h,c,d,a,b,X[15],16,t[47])
+  b=z(h,b,c,d,a,X[ 2],23,t[48])
+
+  a=z(i,a,b,c,d,X[ 0], 6,t[49])
+  d=z(i,d,a,b,c,X[ 7],10,t[50])
+  c=z(i,c,d,a,b,X[14],15,t[51])
+  b=z(i,b,c,d,a,X[ 5],21,t[52])
+  a=z(i,a,b,c,d,X[12], 6,t[53])
+  d=z(i,d,a,b,c,X[ 3],10,t[54])
+  c=z(i,c,d,a,b,X[10],15,t[55])
+  b=z(i,b,c,d,a,X[ 1],21,t[56])
+  a=z(i,a,b,c,d,X[ 8], 6,t[57])
+  d=z(i,d,a,b,c,X[15],10,t[58])
+  c=z(i,c,d,a,b,X[ 6],15,t[59])
+  b=z(i,b,c,d,a,X[13],21,t[60])
+  a=z(i,a,b,c,d,X[ 4], 6,t[61])
+  d=z(i,d,a,b,c,X[11],10,t[62])
+  c=z(i,c,d,a,b,X[ 2],15,t[63])
+  b=z(i,b,c,d,a,X[ 9],21,t[64])
+
+  return bit_and(A+a,0xFFFFFFFF),bit_and(B+b,0xFFFFFFFF),
+         bit_and(C+c,0xFFFFFFFF),bit_and(D+d,0xFFFFFFFF)
+end
+
+----------------------------------------------------------------
+
+local function md5_update(self, s)
+  self.pos = self.pos + #s
+  s = self.buf .. s
+  for ii = 1, #s - 63, 64 do
+    local X = cut_le_str(sub(s,ii,ii+63),4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4)
+    assert(#X == 16)
+    X[0] = table.remove(X,1) -- zero based!
+    self.a,self.b,self.c,self.d = transform(self.a,self.b,self.c,self.d,X)
+  end
+  self.buf = sub(s, math.floor(#s/64)*64 + 1, #s)
+  return self
+end
+
+local function md5_finish(self)
+  local msgLen = self.pos
+  local padLen = 56 - msgLen % 64
+
+  if msgLen % 64 > 56 then padLen = padLen + 64 end
+
+  if padLen == 0 then padLen = 64 end
+
+  local s = char(128) .. rep(char(0),padLen-1) .. lei2str(bit_and(8*msgLen, 0xFFFFFFFF)) .. lei2str(math.floor(msgLen/0x20000000))
+  md5_update(self, s)
+
+  assert(self.pos % 64 == 0)
+  return lei2str(self.a) .. lei2str(self.b) .. lei2str(self.c) .. lei2str(self.d)
+end
+
+----------------------------------------------------------------
+
+function md5.new()
+  return { a = CONSTS[65], b = CONSTS[66], c = CONSTS[67], d = CONSTS[68],
+           pos = 0,
+           buf = '',
+           update = md5_update,
+           finish = md5_finish }
+end
+
+function md5.tohex(s)
+  return format("%08x%08x%08x%08x", str2bei(sub(s, 1, 4)), str2bei(sub(s, 5, 8)), str2bei(sub(s, 9, 12)), str2bei(sub(s, 13, 16)))
+end
+
+function md5.sum(s)
+  return md5.new():update(s):finish()
+end
+
+function md5.sumhexa(s)
+  return md5.tohex(md5.sum(s))
+end
+
+return md5
diff --git a/moremesecons_luablock/md5_lua/rockspecs/md5-1.0-0.rockspec b/moremesecons_luablock/md5_lua/rockspecs/md5-1.0-0.rockspec
new file mode 100644
index 0000000..4103148
--- /dev/null
+++ b/moremesecons_luablock/md5_lua/rockspecs/md5-1.0-0.rockspec
@@ -0,0 +1,21 @@
+package = "md5"
+version = "1.0-0"
+source = {
+  url = "https://github.com/kikito/md5.lua/archive/v1.0.0.tar.gz",
+  dir = "md5.lua-1.0.0"
+}
+description = {
+   summary = "MD5 sum in pure Lua, with no C and no external dependencies",
+   detailed = "This pure-Lua module computes md5 in Lua 5.1, Lua 5.2 and LuaJIT, using native bit-manipulation libraries when available, and falling back to table-based manipulation of integers in 5.1",
+   homepage = "https://github.com/kikito/md5.lua",
+   license = "MIT"
+}
+dependencies = {
+   "lua >= 5.1"
+}
+build = {
+   type = "builtin",
+   modules = {
+      md5 = "md5.lua"
+   }
+}
diff --git a/moremesecons_luablock/md5_lua/rockspecs/md5-1.0-1.rockspec b/moremesecons_luablock/md5_lua/rockspecs/md5-1.0-1.rockspec
new file mode 100644
index 0000000..f9f5203
--- /dev/null
+++ b/moremesecons_luablock/md5_lua/rockspecs/md5-1.0-1.rockspec
@@ -0,0 +1,21 @@
+package = "md5"
+version = "1.0-1"
+source = {
+  url = "https://github.com/kikito/md5.lua/archive/v1.0.1.tar.gz",
+  dir = "md5.lua-1.0.1"
+}
+description = {
+   summary = "MD5 sum in pure Lua, with no C and no external dependencies",
+   detailed = "This pure-Lua module computes md5 in Lua 5.1, Lua 5.2 and LuaJIT, using native bit-manipulation libraries when available, and falling back to table-based manipulation of integers in 5.1",
+   homepage = "https://github.com/kikito/md5.lua",
+   license = "MIT"
+}
+dependencies = {
+   "lua >= 5.1"
+}
+build = {
+   type = "builtin",
+   modules = {
+      md5 = "md5.lua"
+   }
+}
diff --git a/moremesecons_luablock/md5_lua/rockspecs/md5-1.0-2.rockspec b/moremesecons_luablock/md5_lua/rockspecs/md5-1.0-2.rockspec
new file mode 100644
index 0000000..c8034f9
--- /dev/null
+++ b/moremesecons_luablock/md5_lua/rockspecs/md5-1.0-2.rockspec
@@ -0,0 +1,21 @@
+package = "md5"
+version = "1.0-2"
+source = {
+  url = "https://github.com/kikito/md5.lua/archive/v1.0.2.tar.gz",
+  dir = "md5.lua-1.0.2"
+}
+description = {
+   summary = "MD5 sum in pure Lua, with no C and no external dependencies",
+   detailed = "This pure-Lua module computes md5 in Lua 5.1, Lua 5.2 and LuaJIT, using native bit-manipulation libraries when available, and falling back to table-based manipulation of integers in 5.1",
+   homepage = "https://github.com/kikito/md5.lua",
+   license = "MIT"
+}
+dependencies = {
+   "lua >= 5.1"
+}
+build = {
+   type = "builtin",
+   modules = {
+      md5 = "md5.lua"
+   }
+}
diff --git a/moremesecons_luablock/md5_lua/rockspecs/md5-1.1-0.rockspec b/moremesecons_luablock/md5_lua/rockspecs/md5-1.1-0.rockspec
new file mode 100644
index 0000000..ef1b392
--- /dev/null
+++ b/moremesecons_luablock/md5_lua/rockspecs/md5-1.1-0.rockspec
@@ -0,0 +1,21 @@
+package = "md5"
+version = "1.1-0"
+source = {
+  url = "https://github.com/kikito/md5.lua/archive/v1.1.0.tar.gz",
+  dir = "md5.lua-1.1.0"
+}
+description = {
+   summary = "MD5 sum in pure Lua, with no C and no external dependencies",
+   detailed = "This pure-Lua module computes md5 in Lua 5.1, Lua 5.2 and LuaJIT, using native bit-manipulation libraries when available, and falling back to table-based manipulation of integers in 5.1",
+   homepage = "https://github.com/kikito/md5.lua",
+   license = "MIT"
+}
+dependencies = {
+   "lua >= 5.1"
+}
+build = {
+   type = "builtin",
+   modules = {
+      md5 = "md5.lua"
+   }
+}
diff --git a/moremesecons_luablock/md5_lua/spec/md5_spec.lua b/moremesecons_luablock/md5_lua/spec/md5_spec.lua
new file mode 100644
index 0000000..69dde39
--- /dev/null
+++ b/moremesecons_luablock/md5_lua/spec/md5_spec.lua
@@ -0,0 +1,40 @@
+local md5 = require('md5')
+
+local function hex2bin(hex)
+  local result, _ = hex:gsub('..', function(hexval)
+    return string.char(tonumber(hexval, 16))
+  end)
+  return result
+end
+
+describe('md5', function()
+  describe('md5.sumhexa', function()
+    it('works', function()
+      assert.equal(md5.sumhexa("asdf"), '912ec803b2ce49e4a541068d495ab570')
+      assert.equal(md5.sumhexa('The quick brown fox jumps over the lazy dog'), '9e107d9d372bb6826bd81d3542a419d6')
+      assert.equal(md5.sumhexa('The quick brown fox jumps over the lazy dog.'), 'e4d909c290d0fb1ca068ffaddf22cbd0')
+      assert.equal(md5.sumhexa(''), 'd41d8cd98f00b204e9800998ecf8427e')
+      assert.equal(md5.sumhexa(('1'):rep(824)), 'a126fd3611ab8d9b7e8a3384e2fa78a0')
+      assert.equal(md5.sumhexa(('1'):rep(1528)), '3750b6a29d923b633e05d6ae76895664')
+      local state = md5.new()
+      state:update('Hello')
+      state:update(', World!')
+      assert.equal(md5.tohex(state:finish()), '65a8e27d8879283831b664bd8b7f0ad4')
+    end)
+  end)
+
+  describe('md5.sum', function()
+    it('works', function()
+      assert.equal(md5.sum("asdf"), hex2bin '912ec803b2ce49e4a541068d495ab570')
+      assert.equal(md5.sum('The quick brown fox jumps over the lazy dog'), hex2bin '9e107d9d372bb6826bd81d3542a419d6')
+      assert.equal(md5.sum('The quick brown fox jumps over the lazy dog.'), hex2bin 'e4d909c290d0fb1ca068ffaddf22cbd0')
+      assert.equal(md5.sum(''), hex2bin 'd41d8cd98f00b204e9800998ecf8427e')
+      assert.equal(md5.sum(('1'):rep(824)), hex2bin 'a126fd3611ab8d9b7e8a3384e2fa78a0')
+      assert.equal(md5.sum(('1'):rep(1528)), hex2bin '3750b6a29d923b633e05d6ae76895664')
+      local state = md5.new()
+      state:update('Hello')
+      state:update(', World!')
+      assert.equal(state:finish(), hex2bin '65a8e27d8879283831b664bd8b7f0ad4')
+    end)
+  end)
+end)
diff --git a/moremesecons_playerkiller/depends.txt b/moremesecons_playerkiller/depends.txt
index 886b035..d041f20 100644
--- a/moremesecons_playerkiller/depends.txt
+++ b/moremesecons_playerkiller/depends.txt
@@ -1,3 +1,4 @@
 mesecons
 mesecons_materials
 moremesecons_utils
+craft_guide?
diff --git a/moremesecons_sayer/depends.txt b/moremesecons_sayer/depends.txt
index 4c6f872..376102c 100644
--- a/moremesecons_sayer/depends.txt
+++ b/moremesecons_sayer/depends.txt
@@ -2,3 +2,4 @@ mesecons
 mesecons_noteblock
 moremesecons_utils
 default
+craft_guide?
diff --git a/moremesecons_signalchanger/depends.txt b/moremesecons_signalchanger/depends.txt
index acaa924..0ddb4fb 100644
--- a/moremesecons_signalchanger/depends.txt
+++ b/moremesecons_signalchanger/depends.txt
@@ -1 +1,2 @@
 mesecons
+craft_guide?
diff --git a/moremesecons_switchtorch/depends.txt b/moremesecons_switchtorch/depends.txt
index 7ebf50c..0ddb4fb 100644
--- a/moremesecons_switchtorch/depends.txt
+++ b/moremesecons_switchtorch/depends.txt
@@ -1 +1,2 @@
-mesecons
\ No newline at end of file
+mesecons
+craft_guide?
diff --git a/moremesecons_teleporter/depends.txt b/moremesecons_teleporter/depends.txt
index a259a42..5a7e5e6 100644
--- a/moremesecons_teleporter/depends.txt
+++ b/moremesecons_teleporter/depends.txt
@@ -1,2 +1,3 @@
 mesecons
 moremesecons_utils
+craft_guide?
diff --git a/moremesecons_timegate/depends.txt b/moremesecons_timegate/depends.txt
index acaa924..0ddb4fb 100644
--- a/moremesecons_timegate/depends.txt
+++ b/moremesecons_timegate/depends.txt
@@ -1 +1,2 @@
 mesecons
+craft_guide?
diff --git a/moremesecons_utils/init.lua b/moremesecons_utils/init.lua
index f22c88a..d986272 100644
--- a/moremesecons_utils/init.lua
+++ b/moremesecons_utils/init.lua
@@ -13,7 +13,10 @@ function moremesecons.setting(modname, settingname, default, min)
 		return minetest.settings:get(setting) or default
 	elseif type(default) == "number" then
 		local ret = tonumber(minetest.settings:get(setting)) or default
-		if ret ~= ret then -- NaN
+		if not ret then
+			minetest.log("warning", "[moremesecons_"..modname.."]: setting '"..setting.."' must be a number. Set to default value ("..tostring(default)..").")
+			ret = default
+		elseif ret ~= ret then -- NaN
 			minetest.log("warning", "[moremesecons_"..modname.."]: setting '"..setting.."' is NaN. Set to default value ("..tostring(default)..").")
 			ret = default
 		end
diff --git a/moremesecons_wireless/depends.txt b/moremesecons_wireless/depends.txt
index 79129cd..a26346f 100644
--- a/moremesecons_wireless/depends.txt
+++ b/moremesecons_wireless/depends.txt
@@ -1,3 +1,4 @@
 mesecons
 moremesecons_utils
 digilines?
+craft_guide?
diff --git a/settingtypes.txt b/settingtypes.txt
index 621f29b..7103b34 100644
--- a/settingtypes.txt
+++ b/settingtypes.txt
@@ -1,3 +1,8 @@
+[Adjustable Blinky Plant]
+
+# Minimal interval authorized. Any lower will be set to it.
+moremesecons_adjustable_blinky_plant.min_interval (Minimum Interval) float 0.5
+
 [Craftable Commandblock]
 
 # Space-separated list of authorized commands