vgroup_id	IN:	Vgroup identifier returned by Vattach
	v_id	IN:	Identifier of the vdata or vgroup

	Purpose	Inserts a vdata or vgroup into a vgroup.
	Return value	Returns the position (index) of the inserted element within the vgroup if successful and FAIL (or -1) otherwise.
	Description	Vinsert inserts the vdata or vgroup identified by the parameter v_id into the vgroup identified by the parameter vgroup_id.
		Essentially, Vinsert only inserts a vgroup or vdata. To insert any objects into a vgroup, use Vaddtagref.
		The returned value, index, is either 0 or a positive value, which indicates the position of the inserted element in the vgroup.

	FORTRAN	integer function vfinsrt(vgroup_id, v_id)
		integer vgroup_id, v_id