Next calls: Next call pushed to Mon, 2021-12-06; no call on Mon,
2021-12-27; first call in the new year will be on Mon, 2022-01-24.
Terminology documents: Christian did not have time to work on this,
push to next call.
Travis/Github Actions: Timing on Github actions seems okay-ish but
hasn't seen a lot of testing. As we still have minutes on Travis,
this will be discussed again on the next call.
Cell schema files: Exchange format should be simple; current proposal
is a simple implementation; needs demo with 10X; needs to show that
conversion into sparse matrix is feasible.