Log Message:
Update to Dovecot 1.2.7.

Changes in 1.2.6:

* Upgraded to Unicode 5.2.0

+ Added authtest utility for doing passdb and userdb lookups.
+ login: ssl_security string now also shows the used compression.
- quota: Don't crash with non-Maildir++ quota backend.
- imap proxy: Fixed crashing with some specific password characters.
- dovecot --exec-mail was broken.
- Avoid assert-crashing when two processes try to create index at the
  same time.

Changes in 1.2.7:

* IMAP: IDLE now sends "Still here" notifications to same user's
  connections at the same time. This hopefully reduces power usage
  of some mobile clients that use multiple IDLEing connections.
* IMAP: If imap_capability is set, show it in the login banner.

+ IMAP: Implemented SORT=DISPLAY extension.
- Login process creation could have sometimes failed with epoll_ctl()
  errors or without epoll probably some other strange things could
  have happened.
- Maildir: Fixed some performance issues
- Maildir: Fixed crash when using a lot of keywords.
- Several fixes to QRESYNC extension and modseq handling
- mbox: Make sure failed saves get rolled back with NFS.
- dbox: Several fixes.