Use Matlab coding conventions for demos in plot/ directory. * contrast.m, axis.m, clabel.m, colorbar.m, comet.m, contour.m, contour3.m, cylinder.m, daspect.m, errorbar.m, ezplot.m, fplot.m, grid.m, hold.m, isosurface.m, legend.m, loglog.m, loglogerr.m, pareto.m, patch.m, pbaspect.m, pie.m, pie3.m, plot3.m, plotmatrix.m, plotyy.m, quiver.m, quiver3.m, rectangle.m, refreshdata.m, scatter.m, scatter3.m, semilogx.m, semilogxerr.m, semilogy.m, semilogyerr.m, shading.m, stem.m, subplot.m, text.m, title.m, trimesh.m, triplot.m, trisurf.m, uigetdir.m, uigetfile.m, uimenu.m, uiputfile.m, waitbar.m, xlim.m, ylim.m, zlim.m: Use Matlab coding conventions for demos so that compare plots scripts will function.

--- a/scripts/plot/contour.m
+++ b/scripts/plot/contour.m
@@ -89,5 +89,5 @@
 %! [x, y] = meshgrid (x);
 %! z = sqrt (x.^2 + y.^2) ./ (x.^2 + y.^2 + 1);
 %! contourf (x, y, z, [0.4, 0.4]);
-%! title ("The hole should be filled with the background color");
+%! title ('The hole should be filled with the background color');