v2.1 on website

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ipmpack@1206 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
corrected refs

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ipmpack@1207 edb9625f-4e0d-4859-8d74-9fd3b1da38cb