[Dovecot] 1.0.beta8 released

Next release will probably be called 1.0.rc1. People just don't seem to like the beta name in the version number. :) Also I think we're nearing the final v1.0.

* Fixed a security hole with mbox: "1 LIST .. *" command could
  list all directories and files under the mbox root directory, so
  if your mails were stored in eg. /var/mail/%u/ directory, the
  command would list everything under /var/mail.

+ Unless nfs_check=no or mmap_disable=yes, check for the first login
  if the user's index directory exists in NFS mount. If so, refuse to
  run. This is done only on first login to avoid constant extra
  overhead.
+ If we have plugins set and imap_capability unset, figure out the
  IMAP capabilities automatically by running imap binary at startup.
  The generated capability list isn't updated until Dovecot is
  restarted completely, so if you add or remove IMAP plugins you
  should restart. If you have problems related to this, set
  imap_capabilities setting manually to work around it.
+ Added auth_username_format setting
- pop3_lock_session setting wasn't really working
- Lots of fixes related to quota handling. It's still not working
  perfectly though.
- Lots of index handling fixes, especially with mmap_disable=yes
- Maildir: saving mails could have sometimes caused "Append with UID
  n, but next_uid = m" errors
- flock() locking never timeouted because ignoring SIGALRM caused the
  system call just to be restarted when SIGALRM occurred (probably not
  with all OSes though?)
- kqueue: Fixed "Unrecognized event". Patch by Vaclav Haisman