Merge branch 'ff_instability_mac' into develop

Core/FormFactors/inc/FormFactorPyramid.h

Core/FormFactors/src/FormFactorCone.cpp

Core/FormFactors/src/FormFactorCylinder.cpp

Core/FormFactors/src/FormFactorFullSpheroid.cpp

Core/FormFactors/src/FormFactorPyramid.cpp

Core/FormFactors/src/FormFactorTruncatedSpheroid.cpp

...erenceData/BornAgain/ref_FormFactors_Cuboctahedron.int.gz

Tests/ReferenceData/BornAgain/ref_FormFactors_Pyramid.int.gz