Update backlog
New "ancestry" utility

Loads a genepool (".gep") file, and shows the evolutionary path that
lead to the most successful DNA in the current pool.
Make chromosome mutations much rarer

So far, adding or removing a chromosome was as common as mutating a
gene, but the consequences were often much larger. I made chromosome
mutations rarer than gene mutations, by a factor equal to the number of
genes in a chromosome. This slows down change, so I raised the chances
of mutations in general.
Remove most typical DNA from status update

Too expensive to calculate. The burden has been moved to the "ancestry"
program.
Refactor packages