[dovecot] 0.99.6rc3

Well, "release candidate" wasn't really right name for last two versions. Maybe not for this one either, it has a few changes that could potentially break things badly (new hash table code especially). Anyway, seems to work with me. If I don't see any problems with it for a few days it'll be the final.

The really great news is that we support threading. A lot of people have not used Dovecot simply because it couldn't be used for webmails. Hmm. What's the next most important feature? .. Better mbox support? Shared folders? Quota? LDAP/MySQL/etc. authentication?

Here's the change summary:

v0.99.6 2003-01-xx Timo Sirainen tss@iki.fi

+ THREAD=REFERENCES extension support. ORDEREDSUBJECT would be easy to
  add, but I think it's pretty useless.
+ SORT is much faster now.
+ mbox: If ~/mail directory isn't found, create it.
+ Log login usernames
* Some coding style changes (less typedefs)
- Mails with nested MIME parts might have caused incorrect BODY and
  BODYSTRUCTURE fetches and sometimes might have crashed dovecot
  (assert at imap-bodystructure.c). If client had already successfully
  done the BODY fetching a couple of times, the bug couldn't happen
  anymore since Dovecot then began caching the BODY data. So, this
  mostly happened with new users.
- non-UID SEARCH might gave wrong replies in certain conditions.
- SORT replied always with UIDs instead of sequences.
- If authentication was aborted by client ("*" reply to AUTHENTICATE),
  the login process crashed later.
- STATUS command gave invalid reply for mailboxes with spaces in name
- Timezones were parsed wrong with message dates
- Digest-MD5: We used "qop-options" instead of "qop", which was
  incompatible with at least Cyrus SASL.
- Realms in passwd-file were buggy
- Literals didn't work when logging in
- Crashed if it had to wait for mbox lock
- With invalid configuration auth and login processes were just dying
  and master filling log files infinitely.
- We didn't work with some 64bit systems