now also use courier-authlib (which is new) as the authentication stuff
has been moved there.
This should make our courier system again faily complete, we have been
running this code for almost a year.
- Split into subpackages: courier-pop3 and courier-imap
- pop3 FLAVOR no longer needed, so removed
- Disable ipv6, since if it detects ipv6, it will bind only to the ipv6
socket and expect that to also accept ipv4 connections. Author notified