include experimental exams2blackboard() stuff in NAMESPACE along with
a very rudimentary manual page

-> not clear whether this will be really in the next release, but
playing around with the devel version is easier this way...



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/exams@711 edb9625f-4e0d-4859-8d74-9fd3b1da38cb