* Added User paremeter to Revision::userCan(), Revision::userCanBitfield(), LogEvents...

* Added User paremeter to Revision::userCan(), Revision::userCanBitfield(), LogEventsList::userCan(), LogEventsList::userCanBitfield(), File::userCan() and its subclasses so that they can check against any user instead of always $wgUser.
* Updated callers that have a context or may use another user than $wgUser
* Revision::getUser(), Revision::getUserText(), Revision::getComment() and Revision::getText() also have a User as parameter, but it will be used only when Revision::FOR_THIS_USER is passed in the first parameter