GTRLLI ( list, startx, nvals, rvals, ifail )
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  Get values from a list of reals

    Can be called from the GO.

Receives:
  KI_tag_list_dbl          *list           --- list from which to extract items
  KI_int_index             *startx         --- position in list from which first
                                           --- value is to be extracted
  KI_int_nitems            *nvals          --- number of values to extract
                                           --- from list

Returns:
  double                    rvals[nvals]   --- values extracted from list
  KI_cod_error             *ifail          --- failure indicator

Specific errors:
  KI_list_too_short         'startx' + 'nvals' - 1 is more than list length
  KI_bad_index              'startx' not in range 1 to list length + 1

Description:
  The given values are extracted from the list. The first value is taken from
  the 'startx' position, the second from 'startx' + 1 and so on. The first
  element in the list is number 1.