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Copy DIRECTION by default in REQUEST_INFORMATION

David Gobbi requested to merge dgobbi/vtk:image-filter-direction into master

When SPACING and ORIGIN are copied by the pipeline, the associated DIRECTION should also be copied. Most VTK imaging filters simply need to copy the DIRECTION from the upstream pipeline to the downstream pipeline in order to properly support oriented images. Other filters can manage the DIRECTION in their RequestInformation() if the DIRECTION needs to be modified rather than simply passed through.

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