- don't break on old errors, check for ERROR level log messages

git-svn-id: https://gnunet.org/svn/gnunet@34078 140774ce-b5e7-0310-ab8b-a85725594a96
- better feedback to users about duplicated messages

git-svn-id: https://gnunet.org/svn/gnunet@34079 140774ce-b5e7-0310-ab8b-a85725594a96