[BZ#134505] Diff against specific version

Submitted by Jörgen Lidholm

Description

It would be very nice if one could choose two versionnumbers of a file to perform a diff on. A possible scenario is that I would like to know what differs two older version of a file... Not always the one I'm coding on and the latest in the CVS-tree. As it is now the diff-view is very, very good for viewing a diff instead of looking at a patch. With thisextra feature thistoolwould be even greater!!