ArticleRatings cleanup:
* moved database table schema into its own file + added an updater function so that the DB table gets automagically added when the user runs maintenance/update.php
* added missing $wgAvailableRights definition in setup file
** the changeRating user right really should be renamed to change-rating
* added missing __METHOD__ to some database calls (helps if you ever need to debug DB queries)
* fixed escaping in a few hooked functions -- when you use Database methods properly, you don't need to call addQuotes() or anything as the abstraction layer deals with the escaping for you
* removed some unused globals
* fixed awfully nasty way of constructing a URL in AreHooks::onBaseTemplateToolbox
* added special page alias file for better i18n support (more i18n fixes coming soon)
* added some FIXMEs