Nate Lust, could you take a look at this tiny ticket? All changes in meas_base - at least for now; it's possible I'll have to make a similarly trivial to the demo's expected results, but Jenkins hasn't yet gotten back to me on that question.

The demo check is insensitive to the addition of new columns, so it is indeed just the meas_base branch.

The code all looks fine except for one minor comment on the pr. As a general note I wondered why this plugin is needed, and why you chose to make it a single frame plugin, as it seems it could have been a catalog calculation plugin. Is there something else in single frame measurement that needs this data early? This really seems to just be measuring something off the catalog and seems more appropriate for the other task.

Yup, it should be a CatalogCalculation; I forgot that was an option. Will do.

Rewritten as a CatalogCalculation. Will merge after another Jenkins run.

Merged to master.