* 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.
* This will allow the backend text storage to use different id numbers
* Revisions noting metadata changes can be added to history without duplicating text
(implemented for page move)
This changes the revision table schema and requires running update.php
or maintenance/archives/patch-rev_text_id.sql on existing test wikis.
PostgreSQL table defs are still not in sync, so not updated.
* Removed 'fuzzy title search', it's not been maintained and generally produces unexpected and unwanted results
* Separated search guts (in SearchEngine) from display/control (in SpecialSearch)
* Extracted MySQL3 and MySQL4 variants to subclasses
* Added PHPUnit tests for MySQL3 and MySQL4 search engines, which try to use temporary tables to fiddle in (if configured)
* comments n stuff
