delaunayn: adjust node ordering for positive outward normal vectors (bug #53397) * delaunayn.m: Check sign of simplex volume, flip node order for negative volumes to ensure positive (outward-pointing) normal vectors. Add BISTs to check for positive volumes. * etc/News.8.md: Append function improvement note to delaunayn change paragraph under General Improvements.

function r = __trace__ (t)
  persistent history

  if (isempty (history))
    history = {};
  end
  if (nargin == 0)
    if (nargout == 0)
      history = {};
    else
      r = history;
    end
  elseif (nargin == 1);
    history = [history; t];
  else
    error ('incorrect call to __trace__');
  end

end