otbAtmosphericCorrectionParameters can read aeronet files now. otbImageMetadataCorrectionParameters can read spectral sensitivity from ascii files now. Reflected these changes to otbReflectanceToSurfaceReflectanceImageFilter.

Renamed sources <classname>2.h to <classname>.h and so on. Suppressed otbAtmosphericCorrectionParametersTo6SAtmosphericRadiativeTerms class. Added otbRadiometryCorrectionParametersToAtmosphericRadiativeTerms class instead. Tried to make those classes more reliable and more similar : otbReflectanceToSurfaceReflectanceImageFilter otbSurfaceAdjacencyEffectCorrectionSchemeFilter otbSurfaceReflectanceToReflectanceFilter. Warning : Task on otbAtmosphericEffects class not finished. Test about this class is still deactivated.

Reflected previous changes to otbReflectanceToSurfaceReflectanceImageFilter2. Made related validation tests. Need to clean sources (<classname>2.h to <classname>.h)

Splitted otbAtmosphericCorrectionParameters into otbImageMetadataCorrectionParameters (acquisition-related parameters) and otbAtmosphericCorrectionParameters2 (purely atmosphere-related parameters). Modified AtmosphericCorrectionParametersToAtmosphericRadiativeTerms (among other things) accordingly

BACKOUT #16890 : keep half pixel shift for default origin in OTB, but implies fixing SensorModelAdapter