-doxygen, indentation fixes

git-svn-id: https://gnunet.org/svn/gnunet@31743 140774ce-b5e7-0310-ab8b-a85725594a96
-make sure to link against right libgcrypt, enable abort of gnunet-revocation even if identity service is not running

git-svn-id: https://gnunet.org/svn/gnunet@31744 140774ce-b5e7-0310-ab8b-a85725594a96