fix for bug #0003416: do not stop parsing uri when plugin is not found
- changed semantics for address generator cb: GNUNET_SYSERR indicates stop, >= 0 indicates bytes added


git-svn-id: https://gnunet.org/svn/gnunet@33494 140774ce-b5e7-0310-ab8b-a85725594a96
-indentation fixes

git-svn-id: https://gnunet.org/svn/gnunet@33496 140774ce-b5e7-0310-ab8b-a85725594a96