fixed hierarchical setup with more than two levels for BayesX

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@902 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
small BayesX touch ups

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@903 edb9625f-4e0d-4859-8d74-9fd3b1da38cb