[Patch] Fix the narrow/widen problem in money_get::do_get

[Paolo Carlini]

Gabriel Dos Reis wrote:

>but std::char_traits<> should go.
>  
>
As I understand the issue (basically, as I learned it from Nathan, today 
too) that may be a good idea but then other sections of the standard 
will have to be adapted and tweaked, consistently, right?

Paolo.