make anvil action only cost 1 level.
Note: with this mod, you'll not be able to modify inventory name. This is the limitation of forge.
Tested on Forge version: 12.16.1.1887, Minecraft version: 1.9
Changelog:
1.1.1: Fix a bug that repair enchanted item costs level.
1.1: Now repair does not cost level.
The Cheap Anvil Team
