removing deprecated method and improving textures

airutils_biofuel.lua

@@ -268,8 +268,8 @@ minetest.register_abm({
     interval = 1,
     chance = 1,
     action = function(pos, node)
-        --minetest.env:remove_node(pos)
+        --minetest.remove_node(pos)
-        minetest.env:swap_node(pos,{name = module_name..":biofuel_distiller"})
+        minetest.swap_node(pos,{name = module_name..":biofuel_distiller"})
     end,
 })