Log Message:
Update to Dovecot 1.0.11.

* mail_extra_groups setting was commonly used insecurely. This setting
  is now deprecated. Most users should switch to using
  mail_privileged_group setting, but if you really need the old
  functionality use mail_access_groups instead.

- mbox: Dropped some of the physical size fetch optimizations added
  in v1.0.8. This makes some commands slower, but should fix the rest
  of the problems.
- IMAP: SEARCH BEFORE/ON/SINCE didn't handle timezones correctly.
- ldap: auth_bind was doing lookups using subtree scope instead of
  the scope specified in config file.
- zlib plugin crashfixes by Richard Platel
- master passdbs: pass=yes setting was broken with blocking passdbs
  (e.g. MySQL)