[vtkusers] Correct anatomical orientation of volumes from Niftii and DICOM

[ochampao]

I have tried passing the output of vtkNIFTIImageReader via
vtkImageChangeInformation filter to change the origin to (0,0,0) but this
had no effect, i.e:

// ....
vtkNew<vtkImageChangeInformation> imageInfo;
imageInfo->SetOutputOrigin(0.0, 0.0, 0.0);
imageInfo->SetInputConnection(niftiiReader->GetOutputPort());
imageInfo->Update();

return imageInfo->GetOutput();



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