of normally derived comparison operators >, >=, and == for the
structure phenotype. ( adding #include <utility> was not sufficient
to solve the problem)
Also added function gprop_use_datasets() to give more flexibility
in subclassing the datasets used to train the nets.
Changed the signature of eoMon, eoBin and eoQuadOp to return a bool,
without invalidating fitness. Added a set of invalidators to take over
that job (see for instance eoSGA and eoSGATransform how this can transparantly used)
Derived eoState from eoFunctorStore (for convenience, from a design perspective this may sound wrong)
Added a wrap_op function that does the wrapping for you (see eoOpContainer how this made this functor
exceedingly less hairy). Checked all the tests removed the eoGeneric*Op family (not needed anymore)
and of course changed all the operators to reflect the change (and found a few that didn't
invalidate the fitness, thus really pointing out the advantage of the current approach)
