Table header ordering links should have rel="nofollow" in the <a> tags

I think this is pretty simple: the content is always there, the admin has chosen his/her preferred ordering method, and people have option to order it the they can/want.

But for crawlers, those ordering links kind of mess with them, not understanding that it's always the same page, the same content, with just different ordering. In my Google for Webmasters, I have lots and lots of errors because of this issue, mainly because the URLs always change (and the crawlers got them), but the Page Title not.

Thanks for attention.