fixed fitted() and residuals(), also support for multivariate distributions in residuals()

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@826 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
small fix in BayesX in rename.p using beta distribution

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@827 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
small fix in summary()

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@828 edb9625f-4e0d-4859-8d74-9fd3b1da38cb