small edit for verbose option in IWLS.R

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@1046 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
dropped uni.slice3()

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@1047 edb9625f-4e0d-4859-8d74-9fd3b1da38cb