[boost] has_operator_new

I've made a TRAK item to request a new type traits feature - has_operator_new. I've included an implementation and a test - both type_traitsified. Hope you can see fit to check it out, and if it's OK, check it in. Let me know when you do this. Once this is in, I can clear a dependent feature request TRAK item from the serialization library. Robert Ramey