h_id	IN:	Identifier of the bit-access element to be disposed of
	flushbit	IN:	Specifies how the leftover bits are to be flushed

	Purpose	Disposes of the specified bit-access file element.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	If called after a bit-write operation, Hendbitaccess flushes all buffered bits to the dataset, then calls Hendaccess.
		"Leftover bits" are bits that have been buffered, but are fewer than the number of bits defined by BITNUM, which is usually set to 8.
		Valid codes for flushbit are: 0 for flush with zeros, 1 for flush with ones and -1 for dispose of leftover bits