[v3] Fix money_get::do_get(..., long double&) buffer size

[Paolo Carlini]

Hi,

this was a pretty serious bug, with potential security
implications, pretty easy to fix, however (*)

Luckily, the monetary facets are still not in wide use.

I took the occasion to avoid some c_str() in favor of data(),
when '\0' is not really needed: appending it has a cost,
albeit minor.

Tested x86-linux, committed.

Paolo.

(*) Long term, the performance issues of our implementation
should be definitely addressed: at minimum, we must speed
up 'narrow' as suggested by Martin a while ago...

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