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ENH: Added support for oriented grid Transform

Andras Lasso requested to merge github/fork/lassoan/oriented-grid-transform-integ into master
  • Added a new class, vtkOrientedGridTransform, which is based on vtkGridTransform but orientation of the grid can be specified as well.
  • Added test for vtkOrientedGridTransform to verify its derivative and inverse computation and equivalence with ITK displacement field transform.
  • Simplified vtkMRMLGridTransform node: transform parameters are read/written into ITK transform file, no duplicate saving is done in the scene.
  • Removed unused vtkITK files: itkDisplacementFieldTransform, itkEncodedTransformFileReader/Writer, as they were not used (and some of them even had the same name as existing ITK files).
  • Support reading/writing of grid transform from/to nrrd, nhdr, mha, mhd, nii, nii.gz files

Resolves: http://www.na-mic.org/Bug/view.php?id=3597 http://www.na-mic.org/Bug/view.php?id=3444

Partially resolves: http://www.na-mic.org/Bug/view.php?id=3598

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