DELIVL ( list, startx, nvals, ifail )
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  Delete items from a list

    Can be called from the GO.

Receives:
  KI_tag_list              *list           --- list from which to delete items
  KI_int_index             *startx         --- position in list at which to
                                           --- start deleting items
  KI_int_nitems            *nvals          --- number of items to delete

Returns:
  KI_cod_error             *ifail          --- failure indicator

Specific errors:
  KI_list_too_short         'startx' + 'nvals' - 1 is more than list length

Description:
  'nvals' are deleted from the given list, starting from the position 'startx'.