There are a few minor changes here compared to black; it flagged
unnecessary string concatenations, and has slightly different
opinions on line length.
This adds two CI runs: a quick one that happens for every pull
request and merge to master, and a longer one that happens daily.
This also adds a new installation group to setup.py because the
`easy` group isn't currently installable, and some of the dependencies
specified there need to be present for the tests to run.
