dlls/oledb32: added conversions for R8,BOOL,DATE,DBTIMESTAMP

[Andreas Pflug]

convert_DataConvert now know the types DBTYPE_R8, DBTYPE_BOOL, 
DBTYPE_DATE and will convert from all source types supported by 
VarXXXFromYYY functions.
DBTYPE_TIMESTAMP is supported to convert from and to DBTYPE_DATE.
get_length is extended accordingly.

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