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

[Gabriel Dos Reis]

Paolo Carlini <pcarlini@suse.de> writes:

| Martin Sebor wrote:
| 
| > Most likely because no one relies on the many obscure requirements
| > in C++ locale and no one has tried to instantiate your num_get on
| > a POD.
| 
| ... and, by the way, our current char_traits are pretty nice! ;)

but std::char_traits<> should go.

-- Gaby