[Dovecot] 0.99.10.5 release candidate

http://dovecot.org/rc/

Thought I'd still make one 0.99.10.x release now that mbox corruption problems are (hopefully) fixed.

Please test, if no problems are found this will be the final 0.99.10.5. Changes since .4:

+ MySQL authentication, patch by Matthew Reimer
- mbox: APPEND reversed given \Draft and \Deleted flags
- mbox: "LF not found" errors happened sometimes when X-IMAPbase
  header was updated. Possibly corrupted mbox sometimes.
  Thanks to Fabrice Bellet for finding this bug.
- Custom flags couldn't be unset
- Maildir: make sure ":2," is appended to filename when moving mails
  from new/ to cur/.