- delete unused message type


git-svn-id: https://gnunet.org/svn/gnunet@32178 140774ce-b5e7-0310-ab8b-a85725594a96
preference logging


git-svn-id: https://gnunet.org/svn/gnunet@32179 140774ce-b5e7-0310-ab8b-a85725594a96
docu


git-svn-id: https://gnunet.org/svn/gnunet@32180 140774ce-b5e7-0310-ab8b-a85725594a96