[v3] ext/type_traits.h

[Paolo Carlini]

Benjamin Kosnik wrote:
>> Ah, yes, I also used a restricted version of the same traits in locale 
>> (locale_facets.tcc), and commonizing that code too would be great... 
>> provided we make sure not injecting non-uglified names in a standard 
>> header...
>>     
>
> Got it. 
>
> Good catch y'all. I missed this one.
>   
By the way, thanks Benjamin for the long overdue clean-up!

Paolo.