maildir: Added some checks for UIDs reaching 2^31-1. Saving messages when it's reached will be handled by assert-crash for now.
maildir: Added some checks for UIDs reaching 2^31-1.
Saving messages when it's reached will be handled by assert-crash for now.

--HG--
branch : HEAD

dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot