(bug 27715) Make imageinfo api module respect revDelete.
This treats metadata and similar properties to be deleted if the file is deleted, since they
are derived from the file, and i know examples of where the file was deleted to hide sensitive
data in exif. Does still show the file size if file is deleted, because that is what is done
in interface. Follows what ApiQueryLogEvents does and outputs userhidden="" if the user cannot
be displayed due to being hidden.
Due to this bug, all the secret oversight cabal info could be visible for images, so probably
should be merged into wmf stuff soon as possible.