* Put the LinkCache update in WikiPage::updateRevisionOn() so that we are sure that...

* Put the LinkCache update in WikiPage::updateRevisionOn() so that we are sure that it is executed every time that function get called (and the update succeeds of course); and removed the call to Title::resetArticleID() which is already done by insertOn()
* Also update $this->mLatest and $this->mIsRedirect in updateRevisionOn() (will use this in ApiEditPage to have to create another istance just to grab the new revision ID)
* In WikiPage::doEdit(), get the current latest before going through the process since it's now updated in updateRevisionOn() (would break RecentChange::notifyEdit() otherwise) and pass the current redirect state to use the optimisation in updateRedirectOn() if possible