[Dovecot] Dovecot Quota plugin as Couier quota

I get a similar behavior between dovecot quota plugin and courier quota with the attached patch.

When the client change flags, then is forced to recalc. This is because I don't know how to get the changed flags on quota sync method.

The courier quota behavior is avoid to count all deleted mails, include "mark as deleted" mails.

-- Antonio Pérez-Aranda Alcaide aperezaranda@yaco.es

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