Merge branch 'Add-RescaleReverseLUT' into 'master'

src/Cxx.md

src/Cxx/Utilities/ColorMapToLUT.cxx

src/Cxx/Utilities/RescaleReverseLUT.cxx

src/Cxx/Utilities/RescaleReverseLUT.md

src/Python.md

src/Python/Utilities/ColorMapToLUT_JSON.py

src/Python/Utilities/ColorMapToLUT_XML.md

src/Python/Utilities/ColorMapToLUT_XML.py

src/Python/Utilities/RescaleReverseLUT.md

src/Python/Utilities/RescaleReverseLUT.py

src/Testing/Baseline/Cxx/Utilities/TestRescaleReverseLUT.png

...sting/Baseline/Python/Utilities/TestRescaleReverseLUT.png