Merge branch 'roughness_stable' into develop

Core/Algorithms/MultiLayerRoughnessDWBASimulation.cpp

Core/Algorithms/MultiLayerRoughnessDWBASimulation.h

Core/CMakeLists.txt

Core/PythonAPI/libBornAgainCore.py

Core/PythonAPI/libBornAgainCore_wrap.cxx

Core/PythonAPI/libBornAgainCore_wrap.h

Fit/PythonAPI/libBornAgainFit.py

Fit/PythonAPI/libBornAgainFit_wrap.cxx

Fit/PythonAPI/libBornAgainFit_wrap.h

Tests/FunctionalTests/TestPyCore/layerwithroughness.py

Tests/FunctionalTests/TestPyCore/mesocrystal1.py

Tests/ReferenceData/BornAgain/mesocrystal01_reference.int.gz

Tests/ReferenceData/BornAgain/ref_MesoCrystal.int.gz

...eferenceData/BornAgain/ref_MultiLayerWithRoughness.int.gz

Tests/ReferenceData/BornAgain/roughness01_reference.int.gz

ThirdParty/CMakeLists.txt

ThirdParty/Faddeeva/CMakeLists.txt

ThirdParty/Faddeeva/Faddeeva.cc

ThirdParty/Faddeeva/Faddeeva.hh