Work on warnings from clang-11

Base/Axis/ConstKBinAxis.h

Core/Computation/ConstantBackground.h

Core/Computation/PoissonNoiseBackground.h

Core/Simulation/DepthProbeSimulation.h

Core/Simulation/OffSpecSimulation.h

Core/Simulation/SpecularSimulation.h

Device/Detector/SimpleUnitConverters.h

Fit/Adapter/MinimizerAdapter.h

GUI/coregui/Models/ParameterTranslators.h

Sample/Aggregate/InterferenceFunction1DLattice.h

Sample/Aggregate/InterferenceFunction2DLattice.h

Sample/Aggregate/InterferenceFunction2DParaCrystal.h

Sample/Aggregate/InterferenceFunction2DSuperLattice.h

Sample/Aggregate/InterferenceFunction3DLattice.h

Sample/Aggregate/InterferenceFunctionFinite2DLattice.h

Sample/Aggregate/InterferenceFunctionFinite3DLattice.h

Sample/Aggregate/InterferenceFunctionHardDisk.h

Sample/Aggregate/InterferenceFunctionNone.h

Sample/Aggregate/InterferenceFunctionRadialParaCrystal.h

Sample/Aggregate/InterferenceFunctionTwin.h