* More parser tests, also added 'variant' option for testing
* Add global $wgDefaultLanguageVariant, can be used to set a default
fallback variant
* Restructured some of the parser code in LanguageConverter, fix flag
processing and add some comments to despookify the old zh code :)
* Cleanup of some old hacks in LanguageSr and Kk (do not use the global
title object, but the one passed to the parser)
* Removed some backtracking regexes with an O(N^2) worst case, replaced with StringUtils::delimiterReplace(). There is a beneficial functional difference: /*/ is no longer considered to be a complete CSS comment.
* Changed the parser strip state from an array to an object. This should hopefully avoid the PHP bugs with array references. StripState uses the new ReplacementArray to do the replacements, thereby supporting FSS.
* Removed DatabaseFunctions.php from the default startup sequence. Moved wfGetDB() to GlobalFunctions.php.
* Introduced the SiteStats class, with a collection of cached site stats accessor functions.
* Removed all global functions from Parser.php, they don't belong there.
* Made LanguageConverter use the new ReplacementArray class instead of managing its own FSS objects.
