Implemented co-evolution

Made several duplicate methods in SymbRegMOO such that co-evolution can
be run. The logic hasn't been tested yet, but the class seems able to
accept two populations and evolve based on fitness from subclasses of
the other population. More testing is needed.
Refined both GA and co-evolution

Changed a lot of files and fixed some bugs in the transfer class such
that the GA yields correct results, both TaxFitness and TaxCodeFitness.
Clean-Up

Have mostly been writing unit tests, changin minor bugs, cleaning the
code up and commenting.
Merge pull request #2 from jbrosen/MITRE_MOO_CO_EVO

Mitre moo co evo