ENH: BandMathX, added a useful message when no expression are set. Good for the users, and for the developer of the filter himself

ENH: Adding applications for learning/classification of geometries in a shapefile (written by David Youssefi during his internship at cnes)

BandMathX app: can take expr or cst from txt files. importContext (from otbBandMathImageFilterX) improved

BUG: Allowing to force default mode with Pleiades images in BundleToPerfectSensor and SuperImpose applications