added small simstudy on rs()

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@1097 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
more for rs_sim.R

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@1098 edb9625f-4e0d-4859-8d74-9fd3b1da38cb