Merged filerepo-work branch:
- Added support for configuration of an arbitrary number of commons-style file repositories.
- Split Image.php into filerepo/File.php and filerepo/LocalFile.php
- Renamed Image::getImagePath() to File::getPath()
- Added initial support for timestamp-based file fetching (OldLocalFile), to be expanded upon by aaron.
- Changed the interface for Image/File object creation: use wfFindFile() or wfLocalFile() depending on semantics
- ImageGallery::add() now accepts a title object as the first parameter
- Moved file handling operations on upload from SpecialUpload to File
- Removed path-related functions from ImageFunctions.php. Removed static path accessors from File.
- Added a Content-Disposition header to thumb.php output
- Improved thumb.php error handling
- Updated the unit test suite to kind of partially work with modern computers. RunTests.php doesn't work just yet. Fixed an actual regression that the test suite detected -- moved some defines to Defines.php where they will be loaded consistently.