Further M_PI removal

App/src/TestFormFactor.cpp

App/src/TestInfLongBox.cpp

App/src/TestInfLongRipple1.cpp

App/src/TestInfLongRipple2.cpp

App/src/TestMiscellaneous.cpp

App/src/TestPolarizedMeso.cpp

App/src/TestRootTree.cpp

Core/Algorithms/src/DWBADiffuseReflection.cpp

Core/Algorithms/src/IsGISAXSMorphologyFileStrategy.cpp

Core/Algorithms/src/MultiLayerDWBASimulation.cpp

Core/Algorithms/src/MultiLayerRoughnessDWBASimulation.cpp

Core/Algorithms/src/SpecularMatrix.cpp

Core/Samples/src/InterferenceFunction1DLattice.cpp

Core/Samples/src/InterferenceFunction2DLattice.cpp

Core/Samples/src/InterferenceFunction2DParaCrystal.cpp

Core/Samples/src/Lattice.cpp

Core/Samples/src/LayerRoughness.cpp