Overhaul image, imagesc to use newplot and support low-level invocation form. * scripts/image/image.m: New variable do_new indicates high-level calling form. For high-level invocation, call newplot before __img__. Correct linearity check if vectors are reversed (high-to-low values). Only apply image properties to axes if doing a high-level invocation. * scripts/image/imagesc.m: New variable do_new indicates high-level calling form. Delete subfunction __imagesc__ and incorporate minimal amount of code into imagesc. Only apply climits for high-level invocation.

function out = subsref (f, x)
  switch (x.type)
    case "()"
      n = f.polynomial;
      out = filter (n.poly, 1, x.subs{1});
    case "."
      fld = x.subs;
      if (strcmp (fld, "polynomial"))
        out = f.polynomial;
      else
        error ("@FIRfilter/subsref: invalid property \"%s\"", fld);
      endif
    otherwise
      error ("@FIRfilter/subsref: invalid subscript type for FIR filter");
  endswitch
endfunction