[dovecot] 0.99.6rc1 released

Again rc, just in case I broke something. Or maybe I should just start creating nightly CVS snapshots. Anyway, fixes the few bugs people have reported lately:

- 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.
- If authentication was aborted by client ("*" reply to AUTHENTICATE),
  the login process crashed later.
- Digest-MD5: We used "qop-options" instead of "qop", which was
  incompatible with at least Cyrus SASL.
- We didn't work with some 64bit systems
- Realms in passwd-file were buggy
* Some coding style changes (less typedefs)