[Dovecot] v2.0.20 released

[Timo Sirainen]

http://dovecot.org/releases/2.0/dovecot-2.0.20.tar.gz
http://dovecot.org/releases/2.0/dovecot-2.0.20.tar.gz.sig

        + doveadm user: Added -m parameter to show some of the mail settings.
        - doveadm import didn't import messages' flags
        - Make sure IMAP clients can't create directories when accessing
          nonexistent users' mailboxes via shared namespace.
        - Dovecot auth clients authenticating via TCP socket could have failed
          with bogus "PID already in use" errors.