TheDarklingWolf/Cataclysm-DDA — pull request #1316 by Uneron (2013-06-01 17:36:07+00:00)
Title: Made mutation categories actually matter.

Makes the primary mutation category have significant influence. Traits from
other categories have a high chance of being removed and traits from the primary a higher chance of appearing. It is now very difficult to end up with every single trait in the entire game just because you stand around in a sarcophagus for a day.