Tri

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- Fix FiniteEdgeIterator to indeed only output finite edges.
- output_{vertices|triangles} also outputs is_finite property of vertex/
triangle.

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- Using robust predicates again.
- Resolved small bug: vertex info was added twice.
- output_{vertices|triangles} also outputs info property of vertex/triangle.

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- Removed dependency on predicates package
(for now, as this package is not stable, yet)
- Changed print statements to use logging.
- ToPointsAndSegments class added.
- ConvexHullIterator added (as alias for TriangleIterator).
- RegionatedIterator added.
- Initial VoronoiTransformer added.

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- Initial version.