file_id	IN:	File identifier returned by Hopen
	vdata_id	IN:	Vdata identifier returned by VSattach

	Purpose	Remove a vdata from a file.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) if not successful.
	Description	VSdelete removes the vdata identified by the parameter vdata_id from the file identified by the parameter file_id.

	FORTRAN	integer function vsfdlte(file_id, vdata_id)
		integer file_id, vdata_id