added the ability to redefine apples so that they'll fall when nearby leaves

disappear (defaults to true).  Moved leafdecay code into its own file.  Moved
sapling configs into settings.lua

leafdecay.lua

@@ -0,0 +1,44 @@
+-- leaf decay
+
+minetest.register_abm({
+	nodenames = moretrees.leaves_list,
+	interval = moretrees.leafdecay_delay,
+	chance = moretrees.leafdecay_chance,
+	action = function(pos, node, active_object_count, active_object_count_wider)
+		if not minetest.env:find_node_near(pos, moretrees.leafdecay_radius, moretrees.trunks_list) then
+			minetest.env:remove_node(pos)
+			minetest.env:dig_node(pos)
+		end
+	end
+})
+
+minetest.register_abm({
+	nodenames = "moretrees:palm_leaves",
+	interval = moretrees.leafdecay_delay,
+	chance = moretrees.leafdecay_chance,
+	action = function(pos, node, active_object_count, active_object_count_wider)
+		if not minetest.env:find_node_near(pos, moretrees.palm_leafdecay_radius, moretrees.trunks_list) then
+			minetest.env:remove_node(pos)
+			minetest.env:dig_node(pos)
+		end
+	end
+})
+
+
+if moretrees.enable_replace_default_trees then
+	minetest.register_alias("mapgen_tree", "air")
+	minetest.register_alias("mapgen_leaves", "air")
+	plantslib:register_generate_plant(moretrees.beech_biome, moretrees.beech_model)
+elseif moretrees.enable_default_leafdecay then
+	minetest.register_abm({
+		nodenames = "default:leaves",
+		interval = moretrees.default_leafdecay_delay,
+		chance = moretrees.default_leafdecay_chance,
+		action = function(pos, node, active_object_count, active_object_count_wider)
+			if not minetest.env:find_node_near(pos, moretrees.default_leafdecay_radius, {"default:tree"}) then
+				minetest.env:remove_node(pos)
+				minetest.env:dig_node(pos)
+			end
+		end
+	})	
+end