ENH: functor which generate an otb::Image from otb::VectorImage. The pixel value is the mean of the component pixel value

ENH: otbUnaryFunctorNeighborhoodWithOffsetImageFilter : radius type is now SizeType and not any more unsigned int, but SetRadius(unsigned int radius) still exists

ENH: Use GDAL for PNG and JPEG file formats. PB with PNG indexe image file coding : the ioTvCheckReadPNGIndexee test check it.