major revision of constparty vignette, some FIXMEs remain

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/partykit@531 255f4249-2263-4417-b1ea-8498779e27a7
add psychotools/psychotree for extended mob vignette

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/partykit@532 255f4249-2263-4417-b1ea-8498779e27a7