Tweaks & Purifier

OK OK I'll make an injectable Purifier too.  ;-P
Morale support

If find-in-files is right, these and the iuse are all the code I need to
make the morale effects.  Seems too easy?
The serums themselves

I kinda liked magenta mutagen better than light_green.  So I let some of
these vary their colors.

Check the health, nutrition, etc effects: mutating should take a lot out
of you.  Erred on the side of playability at this point.