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 [r1, r2] = bug57941a (A)
  fh1 = @nested1;
  function z = nested1 (x)
    z = A * x;
  end
  fh2 = @nested2;
  function z = nested2 (x,y)
    z = A * x .* y;
  end
  r1 = fh1 (3);
  r2 = fh2 (3, 4);
end