update exrstdattr to support multipart and deep data
update exrstdattr to support multipart and deep data

oglops/IlmBase,oglops/IlmBase,oglops/PyIlmBase,oglops/PyIlmBase,oglops/PyIlmBase,oglops/IlmBase,oglops/OpenEXR,oglops/PyIlmBase,oglops/OpenEXR,oglops/OpenEXR