-doxygen and minor style fixes

git-svn-id: https://gnunet.org/svn/gnunet@34741 140774ce-b5e7-0310-ab8b-a85725594a96
Cleaned up

git-svn-id: https://gnunet.org/svn/gnunet@34742 140774ce-b5e7-0310-ab8b-a85725594a96