[boost] invalid "this is an old version of boost" links

Hi, All the links at the top of documentation pages for previous versions of boost seem to have suddenly become invalid as they all link to http://www.boost.org/doc/libs/ For instance see http://www.boost.org/doc/libs/1_48_0/libs/config/doc/html/boost_config/boost... I cannot remember when I first noticed it, maybe a couple of weeks ago. Cheers, MAT.