[boost] Report on Primary dependencies for

Hi, Thanks Peter for providing this dependency report. There is an issue on this report http://www.pdimov.com/tmp/report/thread.html Primary dependencies for thread *unknown* http://www.pdimov.com/tmp/report/*unknown*.html || * from || || * from || These files are all inside Boost.Thread. I have just remove two direct dependencies Optional and MPL that were not really necessary. Best, Vicente