Modernising the code, improving images

src/Cxx/ImageData/IntersectLine.md

src/Cxx/ImageProcessing/Attenuation.cxx

src/Cxx/ImageProcessing/EnhanceEdges.cxx

src/Cxx/ImageProcessing/EnhanceEdges.md

src/Cxx/ImageProcessing/GaussianSmooth.cxx

src/Cxx/ImageProcessing/HybridMedianComparison.cxx

src/Cxx/ImageProcessing/IdealHighPass.cxx

src/Cxx/ImageProcessing/IdealHighPass.md

src/Cxx/ImageProcessing/IsoSubsample.cxx

src/Cxx/ImageProcessing/IsoSubsample.md

src/Cxx/ImageProcessing/MedianComparison.cxx

src/Cxx/ImageProcessing/MorphologyComparison.cxx

src/Cxx/ImageProcessing/Pad.cxx

src/Cxx/ImageProcessing/Pad.md

src/Cxx/ImageProcessing/RescaleAnImage.cxx

src/Cxx/ImageProcessing/VTKSpectrum.cxx

src/Cxx/ImageProcessing/VTKSpectrum.md

src/Python/ImageProcessing/Attenuation.md

src/Python/ImageProcessing/Attenuation.py

src/Python/ImageProcessing/EnhanceEdges.md