Replace setName("magic constant...") with predefined names in BornAgain namespace

Core/Algorithms/inc/GISASSimulation.h

Core/Algorithms/inc/OffSpecSimulation.h

Core/Algorithms/src/Beam.cpp

Core/Algorithms/src/Distributions.cpp

Core/Algorithms/src/FTDistributions.cpp

Core/Algorithms/src/GISASSimulation.cpp

Core/Algorithms/src/IIntensityNormalizer.cpp

Core/Algorithms/src/IsGISAXSDetector.cpp

Core/Algorithms/src/OffSpecSimulation.cpp

Core/Algorithms/src/RectangularDetector.cpp

Core/Algorithms/src/SphericalDetector.cpp

Core/FormFactors/inc/FormFactorDecoratorDebyeWaller.h

Core/FormFactors/inc/FormFactorDecoratorFactor.h

Core/FormFactors/inc/FormFactorDecoratorMaterial.h

.../FormFactors/inc/FormFactorDecoratorMultiPositionFactor.h

Core/FormFactors/inc/FormFactorDecoratorPositionFactor.h

Core/FormFactors/inc/FormFactorDecoratorRotation.h

Core/FormFactors/inc/FormFactorEllipsoidalCylinder.h

Core/FormFactors/inc/FormFactorFullSphere.h

Core/FormFactors/inc/FormFactorGauss.h