bummped up the life affinity a bit. it was too low - steady state was
being reached far too quickly.
just a few styles to help out a tad before I really go off the rails
with humans vs zombies!!!
added zombies. They're pretty well balanced with the humans right now.
Lots of variables to tweak. Power of humans/zombies, banding power
of each, likelihood of human reproduction, human overcrowding threshold,
initial seed populations, etc.