Integrate coverage into runTests.py
A while back we investigated our test coverage (#7821 (closed)). We should have runTests.py output a coverage report when the user supplies a '--coverage' argument. A couple gotchas we should thing about...
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While investigating #7821 (closed) I found that coverage froze the test run. This might be from coverage being out of date or a stem bug that has since been fixed so just a potential hiccup to keep in mind.
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Does coverage work with python3? We should keep in mind how 'runRests.py --unit --python3 --coverage' will behave.