DNA2 fixes cherrypicked from N3X15.
Changed disability removal to bitmask operators rather than -= as per Chinsky's posts in the diff.
Added deactivate() for midget power.
Forgot a tilde.
Switched some if(mutation) to if(sdisability)
Merge pull request #4100 from Zuhayr/dev

DNA2 EPISODE 2: Revenge of the Bugs