Add std::unordered_* C++11 allocator support

[Paolo Carlini]

Hi,

On 04/21/2013 10:08 PM, François Dumont wrote:
> Hi
>
>     Here is another proposal with:
> - No attempt to remove const key
> - No attempt to use assignment operator
> - noexcept move constructor; I slightly modify a static assertion so 
> that it checks that _M_bucket_index is noexcept qualified which 
> depends on the noexcept qualification of the functors involved in 
> bucket computation
could you please take care of the profile-mode bits too? Let's try to 
keep the 3 modes in sync, I noticed only by chance.

Thanks,
Paolo.