(bug 34863) Make it so an image that was previously deleted and currently does not...

(bug 34863) Make it so an image that was previously deleted and currently does not exist (locally or foreignly), shows a snippet from the deletion (and move) log.

Currently things outside of file namespace display the snippet, so file ns should display snippet for completeness. As far as I can tell, the only reason files don't is because ImagePage class overrides the Article class, and it was unintentional that the snippet was not included in ImagePage class.