Rename magnetic field to magnetization and regenerate functional test reference files

Core/Computation/MainComputation.cpp

Core/Export/ExportToPython.cpp

Core/Material/HomogeneousMaterial.cpp

Core/Material/HomogeneousMaterial.h

Core/Multilayer/Layer.cpp

Core/Multilayer/MultiLayer.cpp

Core/StandardSamples/MagneticParticlesBuilder.cpp

Tests/Functional/Python/PyCore/polmagcylinders2.py

...eferenceData/Special/polmagcylinders2_reference_00.int.gz

...eferenceData/Special/polmagcylinders2_reference_01.int.gz

...eferenceData/Special/polmagcylinders2_reference_10.int.gz

...eferenceData/Special/polmagcylinders2_reference_11.int.gz

Tests/ReferenceData/StandardSuite/MagneticRotation.int.gz

Tests/UnitTests/Core/Other/HomogeneousMaterialTest.h

auto/Wrap/libBornAgainCore.py

auto/Wrap/libBornAgainCore_wrap.cpp