[boost] Re-worked regression reports

The XLS-based regression reports have been re-worked to improve their usability and informativeness. In particular, the detailed report page is now spit into seperate pages, one per library, mainly to reduce the load time. The whole thing can be seen at http://tinyurl.com/3a45y. Comments on a further directions for improvement, as well as reports of bugs and broken links are welcome and appreciated. The broken logo and test source links will be fixed in the next run. -- Aleksey Gurtovoy MetaCommunications Engineering