[Mediawiki-l] Versioning for images

[K. Peachey]

Go to the image page and scroll down to the image history section and
then click "Upload a new version of this file" and fill out the form
and it will upload the new version of the image and show it in the
image history section.

You can see this in action at this example image
[Image:OTRS_Wikimedia.svg#filehistory]] as well as amny others when
you look around on wikipedia and other mediawiki installs.