This is mostly a straight port from bash to Python, but we
rename the coverage option to `--coverage` and we add checks
for being in a venv and being correctly provisioned.
Fixes#4009.
- Remove `underscore.js` from `static/third` and fetch it from `npm`.
- Upgrade `underscore.js` to 1.8.3.
- Bump up the `PROVISION_VERSION` to 4.2.
Part of #1709
Also, de-emphasize the process for creating new test modules,
as this is an advanced task that we can further document later
and generally handle as part of code review.
Steve Howell
Rafid Aslam
Tim Abbott
Sahil Dua