Log Message:
Update Cyrus IMAPd to 2.3.13 Release.

Noteworthy changes:
 
* Added an experimental "sql" backend for cyrusdb.  Currently MySQL,
   PostgreSQL, and SQLite are supported.
* Added support for IMAP [CAPABILITY] response code to client-side
   of Murder proxies.
* Added support for ManageSieve auto-capability response after
   STARTTLS and after AUTH with a SASL security layer.
* Made MAXWORD and MAXQUOTED sizes configurable via imapd.conf
* Rewrote cyrusdb_quotalegacy.c to use readir()
   rather than glob.c.  This avoids a potential crash due to
   conflicts between glibc and Heimdal implementations of glob().
* Added support for fulldirhash to 'ctl_mboxlist -v'
* Several skiplist transaction bugfixes.
* cyr_expire no longer has a default of 0 (zero) for -X and -D.
   These options must be used explicitly in order to have the desired
   effect.
* Added sieve_utf8fileinto option.
* Added sieve_sasl_send_unsolicited_capability and
   sieve_sasl_expect_unsolicited_capability options.
* Several 32/64-bit compatibility fixes.