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eigendecomposition of shape operator #18

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@aPToul

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@aPToul

During principal curvature estimation (via the shape operator), I am having some trouble getting real values.

The EigenSolver for eigendecomposition finds complex values / vectors, but from the argument in the ReadMe, the shape operator is diagonalizable with real values, since curvature is real and extremal.

I'm wondering if there's a way to encourage the solver to find the closest real valued decomposition (I haven't had a chance to read up on the fundamental forms to verify whether they are indeed always decomposable this way, but I guess it should be the case for the quadratic form).

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