import classlist checking from other projects
@arechnitzer you have a better classlist checker elsewhere? Can we get that into Plom to tackle various issues about classlists silently uploading but then turning out to be bad later.
We generally wnat some kind of "check_classlist" happening in plom-build class foo.csv
before it uploads.
See related #1533 (closed). #1314 (closed). #1292 (closed). Probably others, but those were the ones milestoned for 0.7.2 (and about to slip to 0.7.3 I expect).