bumpup works with 1 group


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/directlabels@682 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
:::ggplot_build -> ::


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/directlabels@683 edb9625f-4e0d-4859-8d74-9fd3b1da38cb