Dovecot Sieve port switched from CMU Sieve to Dovecot

[RW]

When I upgraded my ports yesterday Dovecot deliver stopped working. It
appears that not only has the sieve plugin been upgraded, but it's
switched from the CMU version to Dovecot's own implementation.

This should be documented in UPDATING - it's not covered by the
previous Dovecot note.

http://wiki.dovecot.org/LDA/Sieve/Dovecot#Migration_from_CMUSieve