* Split MediaWiki namespace into MediaWiki and Template (requires changes to all language files)
* Purge links to on edit of Template namespace
* General refactoring of purging and cache invalidation code
* Converted many instances of globals from the query to $_REQUEST
* Renamed near-useless Title::getURL() to Title::getPartialURL()
* Created new Title::getURL(), to replace wfLocalUrl, wfLocalUrlE, wfFullUrl and wfFullUrlE. Replaced most instances throughout the code
* In Parser.php, generalised stripping of <nowiki>, <pre> and <math> to allow more general use such as nesting
* Moved body of Article::preSaveTransform to Parser.php
* Put lots of comments in Title.php
