View old version of space / View page/space by date

It's easy to view an old version of a page, but it would be useful if that page could link to similarly old version of other pages too.

This would be useful when it's desirable to view a snapshot of the space from some time ago. For example if the space documents a product design where older versions will not be updated, but you still might want to view how something worked in a older version. Having this feature would remove the need to export the entire space and save it separately for every snapshot.

One implementation would be to support a request something like "viewpage.action?space=mywiki&pagename=widgets&by_date=20061001" which would return the page as it looked on or before October 1st, 2006. This would be very similar to the current historical view. However each page would like to other pages in the same space using the same by_date parameter.