$old: old title
$nt: new title
$user: user who did the move
-$oldid: old article database ID
-$newid: new article database ID
+$pageid: database ID of the page that's been moved
+$redirid: database ID of the created redirect
'UnknownAction': An unknown "action" has occured (useful for defining
your own actions)
$user: user that watched
$article: article object watched
+'CategoryPageView': before viewing a categorypage in CategoryPage::view
+$catpage: CategoryPage instance
+