Make genetic instability scale according to the mutations

[Daeren]

I'm cleaning up the code for instability at the moment. I'm already seeing a few parts that are, on their own, likely leading to most of the problems people have. For instance, there's the chain reaction effect, the instability values are a little strange in some places, and stuff like Fat makes you more unstable because

I may be grouchy at bad geneticists, but this was a little too far.