Add TTK private files in algorithms and commands

Algorithms/itkDTIEstimatorTensorImageFilter.h

Algorithms/itkDTIEstimatorTensorImageFilter.txx

Algorithms/itkDTIEstimatorWithBFGSTensorImageFilter.h

Algorithms/itkDTIEstimatorWithBFGSTensorImageFilter.txx

Algorithms/itkFiberTrackingImageFilter.h

Algorithms/itkFiberTrackingImageFilter.txx

Algorithms/itkLogEuclideanDTIEstimatorTensorFunction.h

Algorithms/itkLogEuclideanDTIEstimatorTensorFunction.txx

Algorithms/itkLogEuclideanDTIEstimatorTensorImageFilter.h

Algorithms/itkLogEuclideanDTIEstimatorTensorImageFilter.txx

Algorithms/itkProlateSheetTrackingImageFilter.h

Algorithms/itkProlateSheetTrackingImageFilter.txx

Algorithms/itkSheetTrackingImageFilter.h

Algorithms/itkSheetTrackingImageFilter.txx

Algorithms/itkZScoreTensorImageFilter.h

Algorithms/itkZScoreTensorImageFilter.txx

Commands/itkAddGaussianNoiseToDWICommand.cxx

Commands/itkAddGaussianNoiseToDWICommand.h

Commands/itkAddGaussianNoiseToDWICommandFactory.cxx

Commands/itkAddGaussianNoiseToDWICommandFactory.h