minsplit set in raschtree example to save computation time...can likely be removed again after switch to partykit

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/prefmod@213 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
updated vignette output

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/prefmod@214 edb9625f-4e0d-4859-8d74-9fd3b1da38cb