- allow NULL peer id for broken connection

git-svn-id: https://gnunet.org/svn/gnunet@33056 140774ce-b5e7-0310-ab8b-a85725594a96
- doc

git-svn-id: https://gnunet.org/svn/gnunet@33057 140774ce-b5e7-0310-ab8b-a85725594a96
- use full peer IDs

git-svn-id: https://gnunet.org/svn/gnunet@33058 140774ce-b5e7-0310-ab8b-a85725594a96
Notify neighbors if received messages about unknown connections, implements #3378.

git-svn-id: https://gnunet.org/svn/gnunet@33059 140774ce-b5e7-0310-ab8b-a85725594a96
- const

git-svn-id: https://gnunet.org/svn/gnunet@33060 140774ce-b5e7-0310-ab8b-a85725594a96