lsst::geom::Box2I addToCoadd(lsst::afw::image::Image< CoaddPixelT > &coadd, lsst::afw::image::Image< WeightPixelT > &weightMap, lsst::afw::image::Image< CoaddPixelT > const &image, WeightPixelT weight)
add good pixels from an image to a coadd and associated weight map