exclude all interface classes from user doc

Base/Axis/IAxis.h

Base/Pixel/IPixel.h

Base/Types/ICloneable.h

Base/Utils/IFactory.h

Core/Computation/IBackground.h

Core/Residual/IChiSquaredModule.h

Core/Residual/IIntensityFunction.h

Core/Scan/ISpecularScan.h

Core/Simulation/ISimulation.h

Core/Simulation/ISimulation2D.h

Device/Beam/IFootprintFactor.h

Device/Detector/IDetector.h

Device/Detector/IDetector2D.h

Device/Histo/IHistogram.h

Device/Mask/IShape2D.h

Device/Resolution/IDetectorResolution.h

Device/Resolution/IResolutionFunction2D.h

Param/Base/IComponent.h

Param/Base/IParameter.h

Param/Base/IParametricComponent.h