Log Message:
Changes 0.8:
* Optimization: A bunch of patches by M. Doliner (see svn log for more details)
* Feature: Allow the service admin to see the occupants of every rooms
* Feature: Allow the service admin to enter a room with nicknames locked even
  if his nickname isn't the one needed
* Feature: option to disable room logging on the whole component
* Feature: option to save room log files in subdirectories according to date
* Feature: Patch by Smoku to hide empty rooms from disco/browse lists
* Bugfix: Two vulnerabilities in mysql module
* Bugfix: send code=110 when needed according to XEP-0045
* Bugfix: Fix crash when changing roles
* Bugfix: Fixed a bug when entering/leaving a room, it was considered as a nick
  change
* Bugfix: Corrected the errors sent by mu-conference
* Bugfix: Better error code when choosing a nick not conform with the room
  policy
* Bugfix: Fixed a segfault in the decline messages handler
* Bugfix: Avoid a segfault when asking unique room name with a too big user jid
* Bugfix: going in an infinite loop if the user invite the jid ""
* Bugfix: Changed error handling
  - Don't kick a user if the message error is not delivery-related,
    otherwise user could be kicked when refusing a file transfer for example
  - If the user is not kicked, don't discard the error, send it to the
    other user/chatroom
* Bugfix: Hide XEP-0203 delay nodes when sending back presences stanzas