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.
pids on openbsd can be recycled in intervals smaller than one second
(previous it assumed that they couldnt). This prevents maildir
corruption on heavily loaded servers.
Also temporarily disable ipv6; it seems pretty broken right now.
Eliminate the ldap and mysql flavors - now this package generates
subpackages for the pop3 server, and also mysql, ldap and pgsql
authentication modules. Should make installing it from binary
packages significantly easier, and allow us to build less package
combinations.
