Various fixes

Guillaume Paserorequested to merge
various-fixes into master
  • Memory leaks in CompositePreprocessing and ProductFormatter : the inheritance from itk::LightObject has been removed (ITK object needs to be created with ::New() and handled with itk::SmartPointer)
  • Set default output pixel type of composite images to int16
  • Fix bit mask in MaskExtractorFunctor

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