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Make PointTransform actually transform the points

Kenneth Moreland requested to merge kmorel/vtk-m:point-transform-transforms-points into master

The primary (likely only) use of PointTransform is to perform affine transform on the position of the mesh. However, PointTransform did not actually move the mesh. Rather, it just created a new field with the transformed points.

Now, the output has its coordinate system replaced with the transformed one generated (in addition to be added as a field). This can be turned off (but defaults to on).

Also changed the constructor to turn on UseCoordinateSystemAsField so that by default the filter operates on the existing coordinate system and replaces it with the new coordinate system.

Also removed the template parameter on the filter. That added an unnecessary complication to using it.

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