Merge branch 'testing' into develop

Core/Basics/ISingleton.h

Core/HardParticle/FormFactorPolyhedron.cpp

Core/HardParticle/FormFactorTrivial.cpp

Core/HardParticle/FormFactorTrivial.h

Core/InputOutput/OutputDataIOHelper.cpp

Core/Parametrization/ParameterPool.cpp

Core/Parametrization/RealParameter.cpp

Core/Particle/FormFactorCrystal.cpp

Core/Tools/FileSystem.cpp

Core/Tools/FileSystem.h

Tests/Functional/Core/CoreTest.cpp

Tests/Functional/Core/PolDWBAMagCylinders2.cpp

Tests/Functional/PyCore/export/PyExportTest.cpp

Tests/Functional/PyCore/persistence/PyPersistenceTest.cpp

auto/Wrap/doxygen_core.i

auto/Wrap/libBornAgainCore.py

auto/Wrap/libBornAgainCore_wrap.cpp