We can now do this since we finally switched to PHP 5.3 for MW 1.20 and get rid of the silly dirname(__FILE__) stuff :)
Change-Id: Id9b2c9cd2e678197aa81c78adced5d1d31ff57b1
* Moved original URL fetching code and parameter extraction code to thumb.php
* Made use of local repo URL and hash settings to avoid extra config code
* This makes it easy to add hooks for extensions/config to alter behavoir (ExtractThumbParameters hook added)
* Added FileRepo::getHashLevels()
* Thumb handler can now also work without cURL
* Combined related config vars into array config vars
* Folded $thgThumb404File into $thgThumbCallbacks
* Avoided some global pollution