Merge branch '1851_hypserspectral_recipe' into 'develop'

...entation/Cookbook/Art/HyperspectralImages/cuprite_rgb.png

...ook/Art/HyperspectralImages/hyperspectralUnmixing_rgb.png

Documentation/Cookbook/Art/HyperspectralImages/pavia.png

...ntation/Cookbook/Art/HyperspectralImages/rx_detection.png

Documentation/Cookbook/Art/HyperspectralImages/rx_score.png

Documentation/Cookbook/rst/Recipes.rst

Documentation/Cookbook/rst/recipes/hyperspectral.rst

...cations/AppHyperspectral/app/otbHyperspectralUnmixing.cxx