Cache mail headers when saving mails to mbox. We should cache everything, but this is a start..
Cache mail headers when saving mails to mbox. We should cache everything,
but this is a start..

--HG--
branch : HEAD

jwm/dovecot-notmuch,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot,jkerihuel/dovecot,jwm/dovecot-notmuch,dscho/dovecot,jkerihuel/dovecot,dscho/dovecot,dscho/dovecot,jwm/dovecot-notmuch,dscho/dovecot,jwm/dovecot-notmuch,dscho/dovecot,jkerihuel/dovecot