[Patch] Some work on money_get::do_get

[Paolo Carlini]

Benjamin Kosnik wrote:

>>that I didn't like (repeated calls to widen, repetead calls to erase...).
>>    
>>
>Yep... it would be nice to have the all facets do work in one character
>type, minimizing ctype calls, like numpunct/num_get/num_put post Jerry
>Quinn....
>
Very interesting... didn't think about this in full generality...

> I think that is on the TODO list. (Of course, I do need to
>update that: I'll do that today.)
>
Many thanks!

Paolo.