maint: use rows() and columns() to clarify m-files. * gradient.m, interp1q.m, rat.m, tsearchn.m, image.m, imwrite.m, area.m, contourc.m, hist.m, isocolors.m, isonormals.m, meshz.m, print.m, __bar__.m, __go_draw_axes__.m, __interp_cube__.m, __marching_cube__.m, __patch__.m, __print_parse_opts__.m, __quiver__.m, rose.m, shrinkfaces.m, stairs.m, surfnorm.m, tetramesh.m, text.m, deconv.m, spline.m, intersect.m, setdiff.m, setxor.m, union.m, periodogram.m, pcg.m, perms.m: Replace size (x,1) with rows (x) and size(x,2) with columns(x).

--- a/scripts/plot/isonormals.m
+++ b/scripts/plot/isonormals.m
@@ -122,7 +122,7 @@
     otherwise
       print_usage ();
   endswitch
-  if (ismatrix (vp) && size (vp,2) == 3)
+  if (ismatrix (vp) && columns (vp) == 3)
     pa = [];
     v = vp;
   elseif (ishandle (vp))