move experi-psi* to misc/; "Done" not "allowed" at toplevel for CRAN

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/robustbase@557 694ef91d-65df-0310-b7bb-92e67a308ead
eliminate "README", moving "3)" to TODO; 
fix typos there which Eduardo mentioned

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/robustbase@558 694ef91d-65df-0310-b7bb-92e67a308ead