{   This procedure is called to reposition the tape without moving data.
{ Blocks may be skipped either forward or backward.
{
{   The skip terminates if a tape mark or the end of the volume is
{ encountered, or when the requested number of blocks have been skipped.
{
{ NOTE:  Calling this procedure implicitly releases any tape block buffer
{       reservation.
{
{       BAP$TAPE_BM_SKIP_BLOCKS(FILE_IDENTIFIER, DIRECTION, COUNT,
{       RESIDUAL_COUNT, FAILURE_MODES, STATUS)
{
{   FILE_IDENTIFIER (Input):  The file identifier for the file.
{
{  DIRECTION:  (Input) Direction of skipping.  Either amc$forward or
{        amc$backward.
{
{  COUNT:  (Input) The number of blocks or tape marks to be skipped.
{
{  RESIDUAL_COUNT:  (Output) The number of blocks or tape marks that remained
{        to be skipped after the skip terminated.  This will be non-zero if
{        the skip terminates because a boundary was encountered.  (Such as the
{        end of the reel.)
{
{  FAILURE_MODES:  (Output) Detailed information on any tape I/O error.
{
{  STATUS: (Output) Request status.
