Allow setObject(x,y,Types.BIT) if y is a Number & getObject() on bit columns

Problem:
 - setObject(x,y,Types.BIT) throws an exception if y is a Number
 - getObject() on a bit column will return null instead of True or False
Boolean objects

Fix:
 - Added check in setObject() to check to that the Number has value==1.
If so, set to True. False otherwise. This seems to be consistent with
the rest of the code.
 - Added BIT to JDBC datatype list


Cheers,

Kim