Use Octave syntax in graphics demos. * inputdlg.m, listdlg.m, waitbar.m, autumn.m, bone.m, cool.m, copper.m, cubehelix.m, flag.m, gray.m, hot.m, hsv.m, jet.m, lines.m, ocean.m, pink.m, prism.m, rainbow.m, rgbplot.m, spring.m, summer.m, viridis.m, white.m, winter.m, annotation.m, axis.m, clabel.m, daspect.m, datetick.m, grid.m, legend.m, lighting.m, material.m, pbaspect.m, shading.m, text.m, xlim.m, ylim.m, zlim.m, area.m, bar.m, barh.m, camlight.m, colorbar.m, comet.m, comet3.m, contour.m, contour3.m, contourf.m, cylinder.m, ellipsoid.m, errorbar.m, ezcontour.m, ezcontourf.m, ezmesh.m, ezmeshc.m, ezplot.m, ezplot3.m, ezsurf.m, ezsurfc.m, feather.m, fill.m, fplot.m, isocaps.m, isonormals.m, isosurface.m, light.m, line.m, loglog.m, loglogerr.m, mesh.m, meshc.m, meshz.m, pareto.m, patch.m, pcolor.m, pie.m, pie3.m, plot.m, plot3.m, plotmatrix.m, plotyy.m, polar.m, quiver.m, quiver3.m, rectangle.m, ribbon.m, rose.m, scatter.m, scatter3.m, semilogx.m, semilogxerr.m, semilogy.m, semilogyerr.m, shrinkfaces.m, slice.m, smooth3.m, sombrero.m, stairs.m, stem.m, stem3.m, stemleaf.m, surf.m, surfc.m, surfl.m, surfnorm.m, tetramesh.m, trimesh.m, triplot.m, trisurf.m, waterfall.m, copyobj.m, hold.m, linkaxes.m, linkprop.m, printd.m, refreshdata.m, subplot.m, zoom.m, pcr.m, dump_demos.m: Use Octave syntax in graphics demos.