MOSES scoring: final bug fixes from scroing rework.
MOSES scoring: provide a multibehave_cscore

When accumulating behavioral scores, need to properly average
complexiies, coefficients as well.  The old multibscore could
not do this correctly.
Whoops, typos.
Argh. Revive the multibscore classes :-(
MOSES: push the cscore out into the metapop stages.

The cscore is where the diversity evals should be happening...
Allow the caches to use virtual classes.

The operator() might not exist for a veritual base class, and
thus it cannot be called in templated form.  Only the operator()
on the actual instance must be called.