Seeing as the server lets you manually get the history for any save, rather than just your own (search for history:saveid) I created a patch to fix this oversight in the UI. After applying the patch and compiling, the history (calendar) button will appear next to every save in the save browser, rather than just your own. I tried to push it to github, but I got a 403 Forbidden error, so I assume I need to be an admin or something in order to push. The patch is for interface.c.

Patch can be found here: http://pastebin.com/QwrCu44g
This patch might work better, but I haven't tested it: http://pastebin.com/4vz8yEqd

Information on how to use this kind of patch in case you don't know: http://jungels.net/articles/diff-patch-ten-minutes.html

EDIT: You can find a screenshot of what this patch does at http://i.imgur.com/u3aWZ.png
A pre-compiled binary (Mac only, sorry) is available at http://www.mediafire.com/?8ynrxnb697799yy

I know, I was having trouble compiling too, but when I compiled it I had to disable some things to get it to work, like Lua and something related to gravity (though gravity still works.) Also, I have a Mac, so the binary would only work on a Mac since I don't know how to cross-compile. But in case you have a Mac, or someone else who wants a binary does, here you go: http://www.mediafire.com/?8ynrxnb697799yy

It's actually explained in that link I posted, but here you go: http://pastebin.com/NnV6i1Rs

Oh yeah, I forgot about that thread. Hadn't checked it since the post about server load was made. Sorry about that. On the bright side, I doubt enough people are going to use this patch for it to make a difference. Though if most people aren't looking for previous versions of saves, as Simon said, it probably wouldn't make much of a difference anyway, right?