-code cleanup, doxygen

git-svn-id: https://gnunet.org/svn/gnunet@33796 140774ce-b5e7-0310-ab8b-a85725594a96
-avoid passing ambiguously typed 'cls' pointer to address_to_string routine in http_common, code cleanup

git-svn-id: https://gnunet.org/svn/gnunet@33797 140774ce-b5e7-0310-ab8b-a85725594a96