small touch-ups

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/partykit@493 255f4249-2263-4417-b1ea-8498779e27a7
added better pictures from M&S 1963
added party tree for M&S 1963
further touch-ups and improvements



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/partykit@494 255f4249-2263-4417-b1ea-8498779e27a7