CBM reshuffle

Breaks the CBM butchering flag into three groups:
CBM_CIV, found on shockers, drops the common bionics.
CBM_SCI from scientists gives augs slanted toward their needs, and
CBM_OP gives augs that a bionic operator might have.

And yeah, you can have those augs when you butcher them from a corpse.  Created zombie_bio_op, a buffed soldier zed with shocker counter and a nasty melee special, possibly inspired by CBM: Close Quarters Battle.  Beats the stuffing out of my early-start testchars, so hopefully will help those late-game folks work up a sweat.

(Can spawn "naturally" in labs, and in places where you might find zombie soldiers.  Rare and with good reason, but let me know if I should tweak any numbers there.  I'm thinking I should tune 'em up.)