fixed small bugs

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mumin@250 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
merge.model.selection: manual page added

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mumin@251 edb9625f-4e0d-4859-8d74-9fd3b1da38cb