CleverRaven/Cataclysm-DDA — pull request #7251 by BevapDin (2014-04-16 14:42:04+00:00)
Title: Move some items from main item groups to mod specific item groups.

These items are already defined in that mod and any game without that mod should not use them.

The empty item group "museum_guns" is valid. It will not spawn any items there. In games without the Old Guns Pack, the museum has some counters / display cases that are always empty because only items from that mod would spawn there.