Return String representation of a Dao Field type
|nType||Type value of a DaoField object|
|nAttributes||Attributes value of a DaoField object|
String representing the Field type.
This function differs from DaoDataType(), because it also distinguishes between Long fields and Autonumber fields, between Memo fields and Hyperlabel fields etc.
The resulting string is also more 'readable', and does not include the 'Db' prefix that the DataType defines have.