Diff presentatiion: required libraries.
Diff presentatiion: first working version of javascript-based solution.
Changes in XML source are presented.
Integration of diff presentation script and "versions history" window.
Diff presentation: the options form rearranged; added info block and link to google-diff-patch-match lirary.
Dff presentation: Changed the way info elements are initialised.
Diff presentation: allowed to change revision numbers and recompute diffs.
Made versions history window look better.