Remove HURT_FIRE from death mold. [1692]
Remove redundant IM_POIS on s, W, $, and L. [1601]
Move IM_COLD and IM_POIS to monster_base for G; make green glutton not IM_COLD. [1601]
Merge pull request #256 from bensemmler/monster-flags

Clean up monster flags. [1601, 1692]