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* Avoid redirecting error messages in RGBLINK tests We check that RGBLINK prints nothing to stdout, so all that would be captured on stdout is a putative failure message. * Require each RGBLINK test to check error output Otherwise, you can have a test that just... checks nothing! * Document how to add tests Fixes #1300's last remaining item. Also add `checkdiff` rules to remind us to update that doc if any of the test driver scripts are updated.