adding preference generation


git-svn-id: https://gnunet.org/svn/gnunet@32175 140774ce-b5e7-0310-ab8b-a85725594a96
- GNS port is a javaport


git-svn-id: https://gnunet.org/svn/gnunet@32176 140774ce-b5e7-0310-ab8b-a85725594a96
enforcing preferences


git-svn-id: https://gnunet.org/svn/gnunet@32177 140774ce-b5e7-0310-ab8b-a85725594a96