Project: datamanagement
Issue DM-803: Provide a "stackfitCalib" for coadds
Coadds have a Psf class that returns the proper sum of input PSFs at a point. We need the same functionality for the Calib object associated with the Coadd Exposure. This will require making a Calib a baseclass (it currently doesn't have a virtual dtor (although it does have virtual protected members))
Story points: 4