documentation and random  generator


git-svn-id: https://gnunet.org/svn/gnunet@32155 140774ce-b5e7-0310-ab8b-a85725594a96
additional check for sinus generator


git-svn-id: https://gnunet.org/svn/gnunet@32156 140774ce-b5e7-0310-ab8b-a85725594a96