OLEAUT32: (resend) Floating point locale, no negative zero

[Alex Villaci­s Lasso]

This is a resend of two changes in Single|Double conversion to BSTR 
which did not make it into the 20050419 release.

Changelog:
* Force Single|Double conversion to BSTR to use the decimal separator 
defined by the current locale, because that is what native oleaut32 
does, and to be consistent with later parsing of floating-point numbers, 
which uses current locale. Failure to apply this patch causes vartype 
test to fail in non-US locales with a decimal separator other than a period.
* The number form "-0" is *not* allowed to be returned in a 
Single|Double conversion to BSTR in case of numeric undeflow, use 
unsigned zero instead. Some applications depend on this. Test included.
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