[boost] [1.44][build] Improving support for VC10 and Adding support for Intel C++ 12

I'm working through updating msvc.jam to better support VC10, primarily so that intel-win.jam works more cleanly for Intel C++ 12. It looks like the last substantial revision to msvc.jam was for VC8, although it still works well for VC9 and VC10. The changes I've made work well; my next post is to Intel about "internal error: 0_1374", which seems to be a catch-all. My overall goal is to better support the new target architectures and optimization features available in VC10 and Intel C++ 12. I'm new here, so I wanted to make sure that 1) I'm not duplicating work; 2) I'm following the appropriate procedure. BTW, I posted to the Boost Build list a couple days ago and there has been no traffic at all. Any guidance is appreciated.