Rewrite doors:

* Enable glass and obsidian glass doors to be used with mesecons
* Doors can receive signals from a vertical wire placed two
  blocks beneath them, use this to create mesecon-controlled
  double doors
* Fix textures for both git upstream and stable minetest_game
* Shrink code size
* Rename mesecons_compatibility to mesecons_doors.

mesecons_doors/depends.txt

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+mesecons
+doors

mesecons_doors/init.lua

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+-- Modified, from minetest_game/mods/doors/init.lua
+local function on_rightclick(pos, dir, check_name, replace, replace_dir, params)
+	pos.y = pos.y + dir
+	if not minetest.get_node(pos).name == check_name then
+		return
+	end
+	local p2 = minetest.get_node(pos).param2
+	p2 = params[p2 + 1]
+		
+	minetest.swap_node(pos, {name = replace_dir, param2 = p2})
+		
+	pos.y = pos.y - dir
+	minetest.swap_node(pos, {name = replace, param2 = p2})
+
+	if (minetest.get_meta(pos):get_int("right") ~= 0) == (params[1] ~= 3) then
+		minetest.sound_play("door_close", {pos = pos, gain = 0.3, max_hear_distance = 10})
+	else
+		minetest.sound_play("door_open", {pos = pos, gain = 0.3, max_hear_distance = 10})
+	end
+end
+
+local function meseconify_door(name)
+	local function toggle_state1 (pos, node)
+		on_rightclick(pos, 1, name.."_t_1", name.."_b_2", name.."_t_2", {1,2,3,0})
+	end
+
+	local function toggle_state2 (pos, node)
+		on_rightclick(pos, 1, name.."_t_2", name.."_b_1", name.."_t_1", {3,0,1,2})
+	end
+
+	minetest.override_item(name.."_b_1", {
+		mesecons = {effector = {
+			action_on = toggle_state1,
+			action_off = toggle_state1,
+			rules = mesecon.rules.pplate
+		}},
+	})
+
+	minetest.override_item(name.."_b_2", {
+		mesecons = {effector = {
+			action_on = toggle_state2,
+			action_off = toggle_state2,
+			rules = mesecon.rules.pplate
+		}},
+	})
+end
+
+meseconify_door("doors:door_wood")
+meseconify_door("doors:door_steel")
+meseconify_door("doors:door_glass")
+meseconify_door("doors:door_obsidian_glass")