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Improve how labs are tested.
Change how the "examples" are used in the hint section so that people provide full examples up to the tested index, and document this (before it wasn't clear how do this). By using this approach we will consistently test hints.
In the longer term, we might remove the constraint on which hints are returned during the testing, but that requires determining which forms cover which indexes, which is more complex. By asking for the fields now, we make it easier to make that change later.
This makes changes in labs to use the new testing mechanism in hint examples.
This also adds the script "mass-test", which automatically tests all labs. It does this by opening them all in the web browser, triggering the self-test in each lab. You have to manually look at each page, which is a little annoying. That said, that takes very little time. Automatically opening every page is a big improvement in terms of automated testing.