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ex_alpha_shapes_3 : read input points, compute the alpha shape in
regularized mode and find the optimal value of $\alpha$, i. e. the smallest
$\alpha$ such that all input points are in the interior or on the boundary of
the alpha shape, and the alpha shape has a single connected component.
ex_alpha_shapes_with_fast_location_3 : build the alpha shape using an
underlying Delaunay triangulation with Fast_location policy, for efficient
point location.
ex_weighted_alpha_shapes_3 : build the weighted alpha shape of a small
set of spheres and explore the boundary of the alpha complex for $\alpha=0$.
This complex is the nerve of the union of the spheres.
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