Hope I did this in an ok fashion. svn merge --re-integrate was giving me issues
so I just essentially over-wrote my working copy with the version at img_metadata.
There was a missing parameter in GIFMetadataExtractor's skipBlock() call for 'netscape 2.0' data blocks, which threw a monkey in the works.
Now also checking for exceptions thrown by the metadata load and stubbing out null metadata for files which can't be read, rather than letting the exception bubble up and kill MediaWiki. :)
* Fast failure when inconsistencies are detected.
* Skip non-GCF, non-application extensions too.
* Fix error where seeking was not being done properly for non-netscape application extensions.
* Creates a new media handler for GIF files, and extracts metadata such as duration, whether or not the GIF is looped, and the number of frames.
* Uses the extracted metadata for the long file description.
* Considers number of frames in the calculation of image area (multiplies by width and height to get the "time-area", or so to speak).
After this patch is deployed, the work-around to disable GIF scaling on Wikimedia sites can be eliminated.
