* Made BeforeParserMakeImageLinkObj/BeforeGalleryFindFile let hooks set sha1 parameter

* Made BeforeParserMakeImageLinkObj/BeforeGalleryFindFile let hooks set sha1 parameter
* Made FlaggedRevs specify files by sha1,timestamp to handle renames with no redirects. This makes them handled as well as templates in this regard. (bug 27836)
* Moved BeforeGalleryFindFile hook to proper place (don't trigger for non-NS_FILE titles)
* Removed unused mRevisionId field from ImageGallery
* Removed old hotfix from makeMediaLinkObj(); all the current callers would crash beforehand if the title was null anyway
* Updated hook docs (some prior params were missing)
* Broke some long lines and cleaned up some whitespace
* TODO: track file info in core rather than fr_fileSHA1Keys and ugly, duplicated, queries. This should be easy to do now.