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/tetramesh.m
+++ b/scripts/plot/tetramesh.m
@@ -70,7 +70,7 @@
   colmap = colormap ();
   
   if (length (reg) < 3)
-    size_colmap = size (colmap, 1);
+    size_colmap = rows (colmap);
     C = mod ((1:size_T)' - 1, size_colmap) + 1;
     if (size_T < size_colmap && size_T > 1) 
       ## expand to the available range of colors