Paul Price recommended some HSC changes for the Colorterm class. To quote Paul: changed Colorterms so it's not a global, and it can now be configured using Config. See https://github.com/HyperSuprime-Cam/meas_astrom/blob/master/python/lsst/meas/photocal/colorterms.py
This sounds useful. Note that the HSC colorterms.py is in meas_astrom but as of
DM-1578 the LSST version is in pipe_tasks.