Re: [boost] [config] BOOST_NO_CXX11_ALLOCATOR and template aliases

VC11 appears to not define BOOST_NO_CXX11_ALLOCATOR. However, as std::allocator_traits contains two template aliases, rebind_alloc and rebind_traits, and VC11 doesn't support template aliases, it has nonstandard definitions of these two.

This is obviously a problem for code that wants to use std::allocator_traits.

One way to fix that is for the user code to check BOOST_NO_CXX11_TEMPLATE_ALIASES and if so, refrain from using std::allocator_traits.

Another is to just not define BOOST_NO_CXX11_ALLOCATOR for VC11. (VC12 is conforming.)

I tend to be in favor of the second option, as the effect would essentially be the same.

+1. Can you make the changes? I'm not yet in a position to test VC11, though I hope to be soon. John.