* removing some unused global declarations.
* removing or commenting out or adding comments for unused local vars.
* Adding one or two local var declarations.
* Declaring $matches array passed to preg_match() / preg_match_all() as array() before using [not required, just have a slight preference for the explicitness].
* remove one or two pass-by-reference function declarations where the value is not modified.
* Adding some braces to if-else blocks.
* In Parser.php, stripstrate is now an object rather than an array as per r17820, so we no longer need ask for a reference to it (as in "$x =& $this->mStripState;"), and in fact it's probably just simpler to get rid of $x altogether.
* Moving some preg regexes from "" quoting to '' quoting to stop static analyzer whinging about bad escape sequences.
... up to "LinksUpdate.php" in the includes/ directory.
* Deleted DatabaseMysql.php, no longer necessary, database classes are autoloaded.
* Moved wfGetMimeMagic() to MimeMagic::singleton()
* Fixed a couple of __CLASS__.'::'.__FUNCTION__ things.
* remove require_once() throughout whole code, yet left in few places
* move global functions in HttpUtils, ProxyTools, Credits to class methods
* php5 only: __autoload() now used, combined with class->file map and require()
* move initialization of $wgValidSkinNames to Skin::getSkinNames()
* few more changes that will surely break stuff.
- treat NULL properly in watchlist lookup for notification sending
- consolidate a lot of ugly code that fiddles in those tables
- use user_newtalk consistently in enotif mode; watchlist for email notifications, user_newtalk for on-screen message and status check
- clean up handling of other peoples' user_talk pages when in the talk-only limited enotif: only your own will get sent, not other people watching your page
- and others watching your page _will_ work in watchable enotif mode
- add a watch on page + talk page consistently for the auto-add of the user talk page, not just half the page
- don't unwatch the user talk page on view! that's just wacky
- removed UserTalkUpdate, now redundant
- have User::setNewTalk() apply immediately
- clear newtalk from User::clearNotification() and User::clearAllNotifications()
