Log Message:
Update to Dovecot 1.1 beta5.

APPEND should be working now. Also lots of fixes to handling namespace
prefixes and namespaces where virtual separator differs from real
separator.

zlib plugin now supports opening compressed maildir files. This is done
for files that have Z flag.

SORT still assert-crashes sometimes. Would be great if someone could
show me how to reproduce it.  [*** fixed in patches/patch-ad ***]

SEARCH TEXT or Squat indexes apparently still have some problems, but I
couldn't reproduce them
(http://dovecot.org/list/dovecot/2007-October/026254.html).