Master

Hi everybody,

I have added the following functionality to vespa (which I have been using heavily for a recent Vis submission):

1. `kitten.xyz' to Data/Testing for testing everything (taken from the CGAL repo, hope that's ok)
2. A reader vtkCGALXYZReader to read point cloud data. I needed this because the existing readers in VTK did not work for me (e.g., kitten.xyz)
3. Three new classes:

• vtkCGALPCAEstimateNormals for estimating normals of point clouds (needed for Poisson Surface Reconstruction)
• vtkCGALPoissonSurfaceReconstructionDelaunay for surface reconstruction from point clouds
• vtkCGALAdvancingFrontSurfaceReconstruction for another surface reconstruction from point clouds method

I added folders PointSetProcessing and ShapeReconstruction to reflect the structure of CGAL at https://doc.cgal.org/latest/Manual/packages.html.

I have also added cxx tests for everything.

Thomas