New plotting function surfl

[Kai Habel]

Hello all,

the attached changeset adds the new plotting function surfl. To work
properly it requires the previous changeset about surface normals to be
applied as well.

The function surfl plots lighted surfaces. For best visual experience
colormaps like pink, copper, bone, or gray should be used.

For example:

colormap(bone);
surfl(peaks);
shading interp;

The function should work pretty well, so please give it try and report
bugs.

Kai
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