For ts_wep we want to create a new subclass based upon the StampsBase class in meas_algorithms. To do this we are going to change StampsBase `readFits` and `writeFits` methods to allow this according to the prescription Tim Jenness described on slack in [this thread|https://lsstc.slack.com/archives/C01FBUGM2CV/p1616625257255300.] We will then have to add StampsBase to the StorageClass.yaml file in daf_butler.