ISampleBuilder does no longer own m_subtest_item (is now a pointer to const)

Core/Algorithms/ISampleBuilder.h

Core/StandardSamples/LayersWithAbsorptionBuilder.cpp

Core/StandardSamples/ParaCrystalBuilder.cpp

Core/StandardSamples/ParticleInTheAirBuilder.cpp

auto/Wrap/doxygen_core.i

auto/Wrap/doxygen_fit.i

auto/Wrap/libBornAgainCore.py

auto/Wrap/libBornAgainCore_wrap.cpp

auto/Wrap/libBornAgainCore_wrap.h

auto/Wrap/libBornAgainFit.py

auto/Wrap/libBornAgainFit_wrap.cpp

auto/Wrap/libBornAgainFit_wrap.h