- VarParseNumFromStr/VarNumFromParseNum handle negative currency
  numbers.
- More VarCmp support (Decimals and Dates).
- Date support for VB time only (0.0->1.0), corrected some date
  rounding and calculation errors around variant dates and the system
  time.
- Variant date support now round trips! (Date->Variant->Date) due to
  misuse of tm_mon (0..11 not 1..12).
- Better pre-1899 support for dates in the SYSTEMTIME format.
- VarBstrFromCy, VarCyFromStr implemented.
- VarFormat partial implementation (currency and date support).
- VarFormatFromTokens, VarTokenizeFormatString partial implementation
  as per w2k (dates only so far).
- Better debugging when dumping variants, and some additional trace
 points to help debugging.
- Fix to VarBstrCmp to handle null and empty string the same (as per
  w2k, different to msdn).
- Fix return from VarDateFromUdate.
- Correct definition of CY structure.