New method printSampleTree for python users comfort

App/src/TestMultiLayerRoughness.cpp

Core/PythonAPI/src/Crystal.pypp.cpp

Core/PythonAPI/src/FormFactorBox.pypp.cpp

Core/PythonAPI/src/FormFactorCone.pypp.cpp

Core/PythonAPI/src/FormFactorCrystal.pypp.cpp

Core/PythonAPI/src/FormFactorCylinder.pypp.cpp

Core/PythonAPI/src/FormFactorDecoratorDebyeWaller.pypp.cpp

Core/PythonAPI/src/FormFactorEllipsoid.pypp.cpp

Core/PythonAPI/src/FormFactorFullSphere.pypp.cpp

Core/PythonAPI/src/FormFactorFullSpheroid.pypp.cpp

Core/PythonAPI/src/FormFactorGauss.pypp.cpp

Core/PythonAPI/src/FormFactorHemiSpheroid.pypp.cpp

Core/PythonAPI/src/FormFactorLorentz.pypp.cpp

Core/PythonAPI/src/FormFactorParallelepiped.pypp.cpp

Core/PythonAPI/src/FormFactorPrism3.pypp.cpp

Core/PythonAPI/src/FormFactorPrism6.pypp.cpp

Core/PythonAPI/src/FormFactorPyramid.pypp.cpp

Core/PythonAPI/src/FormFactorSphere.pypp.cpp

Core/PythonAPI/src/FormFactorSphereGaussianRadius.pypp.cpp

Core/PythonAPI/src/IClusteredParticles.pypp.cpp