INode etc: pass P args as const references (passed)

Core/Detector/IResolutionFunction2D.cpp

Core/Detector/IResolutionFunction2D.h

Core/HardParticle/FormFactorPolyhedron.cpp

Core/HardParticle/FormFactorPolyhedron.h

Core/Parametrization/INode.cpp

Core/Parametrization/INode.h

Core/Scattering/IFormFactor.cpp

Core/Scattering/IFormFactor.h

Core/Scattering/IFormFactorBorn.cpp

Core/Scattering/IFormFactorBorn.h

Core/Scattering/ISample.cpp

Core/Scattering/ISample.h

Core/Scattering/Rotations.cpp

Core/Scattering/Rotations.h

auto/Wrap/libBornAgainCore.py

auto/Wrap/libBornAgainCore_wrap.cpp

auto/Wrap/libBornAgainCore_wrap.h