doxy: 'Returns' in upper case and 3rd person

Core/Export/SimulationToPython.cpp

Core/Fitting/SimDataPair.h

Device/Data/OutputData.h

Device/Detector/RectangularDetector.h

Device/Detector/SphericalDetector.h

Device/Histo/Histogram1D.h

Device/Histo/IHistogram.cpp

Device/Histo/SimulationResult.h

Device/InputOutput/DataFormatUtils.h

Device/Mask/DetectorMask.h

Fit/Param/RealLimits.h

Fit/Tools/WallclockTimer.h

GUI/Model/Data/Data1DViewItem.h

GUI/Model/Data/DataProperties.h

GUI/Model/Data/SpecularDataItem.h

GUI/Model/Device/DetectorItems.h

GUI/Model/Job/FitParameterContainerItem.cpp

GUI/Util/ComboProperty.cpp

GUI/Util/CoordName.h

GUI/Util/Path.cpp