rearranged all headers to satisfy Doxygen which require @file to come first

Core/Algorithms/inc/Beam.h

Core/Algorithms/inc/ChiSquaredFrequency.h

Core/Algorithms/inc/ChiSquaredModule.h

Core/Algorithms/inc/ConvolutionDetectorResolution.h

Core/Algorithms/inc/DWBADiffuseReflection.h

Core/Algorithms/inc/DWBASimulation.h

Core/Algorithms/inc/DecouplingApproximationStrategy.h

Core/Algorithms/inc/Detector.h

Core/Algorithms/inc/DetectorParameters.h

Core/Algorithms/inc/DiffuseDWBASimulation.h

Core/Algorithms/inc/ExperimentConstants.h

Core/Algorithms/inc/FTDistributions.h

Core/Algorithms/inc/IChiSquaredModule.h

Core/Algorithms/inc/IDetectorResolution.h

Core/Algorithms/inc/IFittingDataSelector.h

Core/Algorithms/inc/IIntensityFunction.h

Core/Algorithms/inc/IInterferenceFunctionStrategy.h

Core/Algorithms/inc/IOutputDataNormalizer.h

Core/Algorithms/inc/IResolutionFunction2D.h

Core/Algorithms/inc/ISampleBuilder.h