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Make vtkPLYWriter able to write point normals

Andras Lasso requested to merge lassoan/vtk:vtkPLYWriter-write-vertex-normals into master

For complex surfaces it is not always trivial to compute the surface normals, so it is useful to store the normals in the mesh. PLY file format can store point normals and vtkPLYReader can read the point normals, but saving of point normals was not implemented in vtkPLYWriter.

This merge request adds this feature. It is based on !2625 (closed), rebased on latest VTK master.

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