vdata_id	IN:	Vdata identifier returned by VSattach
	vdata_name	OUT:	Name of the vdata

	Purpose	Retrieves the name of a vdata.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	VSQueryname retrieves the name of the vdata identified by the parameter vdata_id into the buffer vdata_name.

	FORTRAN	integer function vsqfname(vdata_id, vdata_name)
		integer vdata_id
		character*(*) vdata_name