-let's not introduce stdbool shortly before the release

git-svn-id: https://gnunet.org/svn/gnunet@31735 140774ce-b5e7-0310-ab8b-a85725594a96
-fixing misc format strings

git-svn-id: https://gnunet.org/svn/gnunet@31736 140774ce-b5e7-0310-ab8b-a85725594a96
- Don't crash, _break instead


git-svn-id: https://gnunet.org/svn/gnunet@31738 140774ce-b5e7-0310-ab8b-a85725594a96