ENH: ModelToModelDistance matches 3DMeshMetric format in vtk files when ...

...using VTK filter

-Scalar array is named "Distance" by the VTK filter "vtkDistancePolyDataFilter"
-Scalar array is renamed "Signed" if the computed is signed
-Scalar array is renamed "Absolute" if the computed distance is not signed
-An additional and constant field is added to the vtkPoyData and is called "Original"

https://github.com/NIRALUser/3DMetricTools/compare/96b73776c3e59328b5f45c8205021258cd3b93bf...3f4a9be5b2cd4a36ac502a276a9a32d82c33dbd3