Add compilable gnunet-gns-import

git-svn-id: https://gnunet.org/svn/gnunet@31681 140774ce-b5e7-0310-ab8b-a85725594a96
A docfix and a style fix

git-svn-id: https://gnunet.org/svn/gnunet@31682 140774ce-b5e7-0310-ab8b-a85725594a96