Don't pass axis handle unnecessarily from high level to low level plot functions. * scripts/plot/comet.m, scripts/plot/comet3.m, scripts/plot/compass.m, scripts/plot/contour.m, scripts/plot/contourf.m, scripts/plot/cylinder.m, scripts/plot/ellipsoid.m, scripts/plot/errorbar.m, scripts/plot/feather.m, scripts/plot/mesh.m, scripts/plot/meshc.m, scripts/plot/meshz.m, scripts/plot/pcolor.m, scripts/plot/plot3.m, scripts/plot/rectangle.m, scripts/plot/rose.m, scripts/plot/scatter3.m, scripts/plot/semilogxerr.m, scripts/plot/semilogy.m, scripts/plot/semilogyerr.m, scripts/plot/slice.m, scripts/plot/sphere.m, scripts/plot/stairs.m, scripts/plot/surf.m, scripts/plot/surfc.m, scripts/plot/surfnorm.m, scripts/plot/trimesh.m, scripts/plot/trisurf.m: Don't pass hax to lower level functions after newplot() has been called.

--- a/scripts/plot/surfnorm.m
+++ b/scripts/plot/surfnorm.m
@@ -118,7 +118,7 @@
    unwind_protect
      hax = newplot (hax);
      
-     surf (hax, x, y, z, varargin{ioff:end});
+     surf (x, y, z, varargin{ioff:end});
      old_hold_state = get (hax, "nextplot");
      unwind_protect
        set (hax, "nextplot", "add");