Getting rid from M_PI

Core/Algorithms/inc/FTDistributions.h

Core/Algorithms/src/DWBASimulation.cpp

Core/Algorithms/src/Distributions.cpp

Core/Algorithms/src/FTDistributions.cpp

Core/Algorithms/src/IInterferenceFunctionStrategy.cpp

Core/Algorithms/src/LayerStrategyBuilder.cpp

Core/FormFactors/inc/IFormFactor.h

Core/FormFactors/inc/IFormFactorBornSeparable.h

Core/FormFactors/src/FormFactorCone.cpp

Core/FormFactors/src/FormFactorCrystal.cpp

Core/FormFactors/src/FormFactorCylinder.cpp

Core/FormFactors/src/FormFactorDecoratorMaterial.cpp

Core/FormFactors/src/FormFactorEllipsoidalCylinder.cpp

Core/FormFactors/src/FormFactorFullSphere.cpp

Core/FormFactors/src/FormFactorFullSpheroid.cpp

Core/FormFactors/src/FormFactorGauss.cpp

Core/FormFactors/src/FormFactorHemiEllipsoid.cpp

Core/FormFactors/src/FormFactorInfLongBox.cpp

Core/FormFactors/src/FormFactorInfLongRipple1.cpp

Core/FormFactors/src/FormFactorInfLongRipple2.cpp