Thank you for the notification. The file did never make it into the
repository. If I can find a useable version somewhere, I will make it
available again as soon as possible.
> Also, the ol_diff page  has an error:
> "TypeError: OpenLayers.Layer.OSM.Mapnik is not a constructor"
I have no idea what is going wrong here. The file itself has not changed
since years. However, it could be than one of the underlying libraries
had changes. I will have a look once I have reliable internet again.