[oleaut32] implement VarMod() + tests, fix bug in VarNot()

[Chris Morgan]

* dlls/oleaut32/variant.c
Chris Morgan <cmorgan at alum.wpi.edu>
Implement VarMod().  Fix VarParseNumFromStr() to work correctly with 
NUMPRS_HEX_OCT flag.  Add a few trace outputs.  Fix VarNot() with VT_CY.

* dlls/oleaut32/tests/vartest.c
Chris Morgan <cmorgan at alum.wpi.edu>
Implement tests for VarMod().  Added char *vtstr() to enhance test debugging 
by returning a text string that corresponds to the inputted type.

Still have a couple of issues with this change.  I'm not sure why the (BSTR) 
tests fail under wine and not windows, I've wrappered them with todo_wine{} 
but they still get listed as failures.

I'm not sure if the fix to VarParseNumFromStr() is the most correct.  It does 
appear to be exactly what windows does, overwrite the characters in the 
buffer but lie and return an incorrect character count.

Also, testing the types in VarMod() results in some 700k additional tests and 
adds some time to the tests, something like 6 seconds on my machine.  Is this 
simply too much to test?  It certainly helped me nail down the types for 
VarMod().

Thanks,
Chris

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