[v3] posix name, valgrind on the facets

[Paolo Carlini]

Benjamin Kosnik wrote:

>I checked your original valgrind case, it seems ok now. You might want
>to re-check my results though.
>
Will do, only to learn myself more about effectively using 'valgrind' 
with v3.

>Ok. I did add your bit to the documentation about locale::global, and
>setlocale vs. LANG.
>
Sorry, I didn't pay attention to that bit of your final patch.

Ciao, Paolo.