Log Message:
Update to Dovecot 1.1.14.

* IMAP: Don't allow APPEND to specify INTERNALDATE more than 2 hours
  into future. With Maildir future INTERNALDATEs may mess up incremental
  backups.

- Date: header was always being added to cache file when saving messages,
  even if clients didn't really want it. This caused POP3-only users to
  have dovecot.index.cache file unneededly.
- Character set conversion in specific mails may have caused Dovecot to
  allocate all the available memory (in default configuration dying after
  having allocated 256 MB). This happened only while searching messages.
- Message address parser didn't handle empty group:; correctly.
- imap/pop3-login: Don't crash when shutting down and destroying clients.
- deliver wasn't using mail_access_groups setting.
- mbox: When doing autodetection, if mbox didn't find an existing mail
  directory it just went and created it anyway, instead of failing the
  storage creation.
- Fixed some error handling in maildir and index code.