changed all "homedecor_" variable and function names to "homedecor."

(underscore -> period).  Similarly for intllib calls and the DEBUG variable.

door_models.lua

@@ -1,14 +1,14 @@
 
 -- Boilerplate to support localized strings if intllib mod is installed.
 local S
-if intllib_modpath then
-    dofile(intllib_modpath.."/intllib.lua")
+if homedecor.intllib_modpath then
+    dofile(homedecor.intllib_modpath.."/intllib.lua")
     S = intllib.Getter(minetest.get_current_modname())
 else
     S = function ( s ) return s end
 end
 
-homedecor_door_models = {
+homedecor.door_models = {
 	{
 		"closet_mahogany",
 		S("Mahogany Closet Door"),