Fixed various vessel bugs.

When merging ores inside a fired vessel, one of the outputs was being put
into the wrong slot.

There were also a couple of crashes when using vessels in Creative, due to
tag compounds being used without first checking for null.
Removed debugging statements.
Fixes #218
Merge pull request #217 from mayaknife/metalMergeBug

Fixed various vessel bugs
Merge pull request #219 from Kittychanley/editing

Fixes #218
Fixes #220
Merge branch 'master' of github.com:Deadrik/TFCraft
Update zh_CN.properties
Merge pull request #221 from crafteverywhere/patch-1

Update zh_CN.properties
Metal in a mold will no longer be lost if heated to liquid in a firepit.
Merge branch 'master' of github.com:Deadrik/TFCraft