working on separating out obs and model.  still need to fix fitterutils
wrap prior product so it can be overrridden by adding to it instead of having to rewrite
move the sampling of priors for minimization to separate method
cleanup of fitterutils
passing tests with obs and model now split
some fix in prospectr for zcontinuous and clargs, adda lnlike_spec wrapper in likelihoodFunction
merging separate_obs