* Changed password hash format, see wikitech-l

* Changed password hash format, see wikitech-l
* Made the PasswordReset and Maintenance extensions, and maintenance/changePassword.php work with CentralAuth, by calling User::setPassword() instead of updating the database directly. They work now even if you use an object cache.
* Don't automatically log in as the user in question when CentralAuthUser::setPassword() is called, it's kind of uncool when an administrator is setting the password of another user.
* Fix bug 14330 by setting the local passwords on demerge