-fix nested context copy

git-svn-id: https://gnunet.org/svn/gnunet@34449 140774ce-b5e7-0310-ab8b-a85725594a96
-fix iteration set

git-svn-id: https://gnunet.org/svn/gnunet@34450 140774ce-b5e7-0310-ab8b-a85725594a96