these enhancements:
* WCAG 1.0 Priority 2/Section 508 accessibility guidelines compliance.
* Timed vacation messages (I will be away from X to Y).
* Major improvements to the procmail driver, including negative matches,
body tests, loop prevention in vacation messages, full character set
support,
* Maildrop driver improvements, including vacation support and full
character set support in the maildrop driver.
* Sieve driver improvements, including numeric spam score tests, sivtest
support, and quota checks before uploading sieve rules.
* Filter rules can be stored in a SQL database.
* Administrators can change other user's filter rules.
* Added Japanese, Russian and Slovak translations.
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