vtkDistancePolyDataFIlter (option added for outputting directions)

Merged Jens Munk Hansen requested to merge jens.munk.hansen/vtk:DisplacementFilter into master

It is very useful for displaying registration results, e.g. glyphs can be used for showing the displacement on one of the vtkPolyData. I have added a regression test demonstrating this

Edited by Jens Munk Hansen

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