more monkeys

more monkeys

My old monkey patch was a bit more extensive than Pasi's, although
it didn't originally include letting apes be tameable with bananas.
No sense in throwing it away:
1) Make monkeys and apes be omnivores instead of carnivores.
2) Make bananas be preferred food for herbivore/omnivore subset
   of Y-class, so excludes carniverous ape, owlbear, and yeti.
   [Sasquatch remain omnivorous but aren't tameable with bananas.]
3) While updating befriend_with_food(), make horses be affected
   only by food they might eat, not by meat and corpses and tins.
   So they'll be somewhat harder to cope with for characters not
   strong enough to kill them.  [Dogs and cats are unchanged.]

Not included (not even implemented...):
0) Allow archeologists to choose monkey for starting pet.
   [The one in "Raiders of the Lost Ark" didn't actually belong
   to Indiana Jones but spent a lot of time accompanying him.]