[boost] Observations - moving from boost_1_39_0 to boost_1_42_0

Lets not lose site of what boost is doing right. I've just updated to boost_1_42_0 from boost_1_39_0 for XCode and MSVC. 1. All but 2 previous workarounds for compiler warnings are non longer needed 2. One wrinkle in build for xcode - now require --layout=versioned 3. MSVC (distributed) build of my app using boost completes 20% faster 4. My app's full test suite runs 10% faster Thanks to all who've made this happen! If your curious, the workarounds are for the archive exceptions in portable_binary_archive, which should have been patched back in 1.40. These are actually in the examples folder, not fully supported by serialization at this time. Jeff