2.3.9 -> 2.3.10 changes

[Jeff Blaine]

For those of you, like me, who really hate downloading a
source distribution to see what changed, heres what is
in 2.3.10's doc/changes.html

      * Added support for "delayed" delete, in which mailboxes are renamed
        to a special admin-only "deleted" hierarchy at the time of the
        DELETE (hiding them from the client), rather than immediately
        removing them from the filesystem. This allows messages/mailboxes
        to be recovered by the admin in case of user error. The mailboxes
        and messages can be removed at a later time by cyr_expire. The new
        delete_mode and deletedprefix options in imapd.conf controls
        whether deletes are "immediate" or "delayed" and the mailbox
        hierarchy for "delayed" deletes. -- courtesy of David Carter and
        FastMail.fm.
      * Fixed the special case of RENAMEing an Inbox, so that it doesn't
        keep the same mailbox uniqueid, thus allowing it to replicate
        properly (seen state is still preserved).
      * Disabled Nagle's algorithm in sync_client and sync_server to
        increase the throughput of the replication protocol. -- courtesy
        of Wes Craig.
      * Added support for a shared \Seen flag on messages (must be enabled
        on a per-mailbox basis with the /vendor/cmu/cyrus-imapd/sharedseen
        mailbox annotation.
      * Added -u and -U options to reconstruct -- courtesy of David
        Carter.
      * Added SETUIDVALIDITY command to the replication protocol --
        courtesy of David Carter.
      * Finally fixed (again?) alignment issues on 64-bit SPARC.
      * Changed message GUIDs used by replication to be the SHA1 hash of
        the messages -- based on work of David Carter and Fastmail.fm.
      * Improve the performance of commands that operate on sequence-sets.
        The sequence-set is now parsed only once, and the commands operate
        on a sorted list of seq-ranges.
      * Added new cyr_synclog utility for adding events to the replication
        log -- courtesy of Fastmail.fm.
      * Added support for PCRE library -- courtesy of Fastmail.fm.
      * Added support for disabling duplicate delivery suppression on a
        per-folder basis with the /vendor/cmu/cyrus-imapd/duplicatedeliver
        mailbox annotation -- courtesy of Fastmail.fm.
      * Fixed miscellaneous bugs and build issues.