bugfix for one explan. variable cases

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/klar@50 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
new function cond.index

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/klar@51 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
prepare new release

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/klar@52 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
documentation fix and speed imrpvement

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/klar@53 edb9625f-4e0d-4859-8d74-9fd3b1da38cb