||Picks among the best n individuals in a population in
direct proportion to their absolute
fitnesses as returned by their fitness() methods relative to the
fitnesses of the other "best" individuals in that n.
||Always picks the first individual in the subpopulation.
||Picks individuals in a population in direct proportion to their
fitnesses as returned by their fitness() methods.
||GreedyOverselection is a SelectionMethod which implements Koza-style
fitness-proportionate greedy overselection.
||MultiSelection is a SelectionMethod which stores some n subordinate
||Picks a random individual in the subpopulation.
||Does a simple tournament selection, limited to the subpopulation it's
working in at the time.