Replaced GCCXML_SKIP_THIS by SWIG. This resolves #1410.

Core/Algorithms/Beam.h

Core/Algorithms/IDetector2D.h

Core/Algorithms/IDetectorResolution.h

Core/Algorithms/IInterferenceFunctionStrategy.h

Core/Algorithms/ILayerRTCoefficients.h

Core/Algorithms/Instrument.h

Core/Algorithms/Simulation.h

Core/Algorithms/SimulationElement.h

Core/Algorithms/SpecularSimulation.h

Core/FormFactors/FormFactorCone.h

Core/FormFactors/FormFactorCrystal.h

Core/FormFactors/FormFactorDecoratorMaterial.h

Core/FormFactors/FormFactorDecoratorMultiPositionFactor.h

Core/FormFactors/FormFactorDecoratorPositionFactor.h

Core/FormFactors/FormFactorFullSpheroid.h

Core/FormFactors/FormFactorHemiEllipsoid.h

Core/FormFactors/FormFactorLongRipple1Gauss.h

Core/FormFactors/FormFactorLongRipple1Lorentz.h

Core/FormFactors/FormFactorRipple1.h

Core/FormFactors/FormFactorTruncatedSphere.h