test + documentation


git-svn-id: https://gnunet.org/svn/gnunet@31851 140774ce-b5e7-0310-ab8b-a85725594a96
more docu



git-svn-id: https://gnunet.org/svn/gnunet@31852 140774ce-b5e7-0310-ab8b-a85725594a96