Added change_modules mod and lots of bugfixes. Now merging to master.

modpol_minetest/api.lua

@@ -10,6 +10,10 @@ local localdir = minetest.get_modpath("modpol") .. "/modpol_minetest"
 --overrides
 dofile (localdir .. "/overrides/interactions.lua")
 
+--testing command for "singleplayer"
+function modpol.msg(text)
+   modpol.interactions.message("singleplayer",text)
+end
 
 -- ===================================================================
 -- Minetest Chatcommands