cosmetics, mostly

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/partykit@557 255f4249-2263-4417-b1ea-8498779e27a7
document differences between ctree in party and partykit

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/partykit@558 255f4249-2263-4417-b1ea-8498779e27a7
ready for submission

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/partykit@559 255f4249-2263-4417-b1ea-8498779e27a7