Bayesian Anova and Bayesian Ancova

This fixes some general code issues with Bayesian Anova and Bayesian
Ancova, and merges Anova code into Ancova code.
code merge bayesian anCova

Code merge between Bayesian Anova and Bayesian Ancova
Merge pull request #91 from mmarsman1/development

Bayesian Anova and Bayesian Ancova