Deep OpenEXR: recognize newer AR/AG/AB channel name convention.
Deep OpenEXR: recognize newer AR/AG/AB channel name convention.

OpenImageIO/oiio,micler/oiio,YangYangTL/oiio,bdeluca/oiio,micler/oiio,lgritz/oiio,lgritz/oiio,OpenImageIO/oiio,bdeluca/oiio,micler/oiio,OpenImageIO/oiio,YangYangTL/oiio,micler/oiio,bdeluca/oiio,lgritz/oiio,lgritz/oiio,OpenImageIO/oiio,YangYangTL/oiio,YangYangTL/oiio,bdeluca/oiio