towards fixing #3363: replacing old iteration API with new monitoring API for core (needs testing, gnunet-core incomplete)

git-svn-id: https://gnunet.org/svn/gnunet@33032 140774ce-b5e7-0310-ab8b-a85725594a96
-also notify monitors on timeout change

git-svn-id: https://gnunet.org/svn/gnunet@33033 140774ce-b5e7-0310-ab8b-a85725594a96
-improve/simplify gnunet-core tool and update man page

git-svn-id: https://gnunet.org/svn/gnunet@33034 140774ce-b5e7-0310-ab8b-a85725594a96
-fix crash on shutdown

git-svn-id: https://gnunet.org/svn/gnunet@33035 140774ce-b5e7-0310-ab8b-a85725594a96
-do call receive done on monitor calls

git-svn-id: https://gnunet.org/svn/gnunet@33036 140774ce-b5e7-0310-ab8b-a85725594a96