improvements suggested by clang-tidy

Base/Axis/Frame.cpp

Base/Axis/FrameUtil.cpp

Base/Axis/PointwiseAxis.cpp

Base/Element/DepthProbeElement.cpp

Base/Element/DepthProbeElement.h

Base/Vector/WavevectorInfo.cpp

Device/Beam/Beam.cpp

Device/Data/DataUtils.cpp

Device/Data/DataUtils.h

Device/Data/Datafield.cpp

Device/Detector/IDetector.cpp

Device/Histo/SimulationResult.cpp

Device/Histo/SimulationResult.h

Device/IO/DataFormatUtils.cpp

Device/IO/IOFactory.cpp

Resample/Element/DiffuseElement.cpp

Resample/Element/DiffuseElement.h

Resample/Element/SpecularElement.cpp

Resample/Element/SpecularElement.h

Resample/Flux/MatrixFlux.cpp