in coachreports/urls.py: use \w instead of \d for getting the test_id
fix test ids
Merge branch 'nalanda-rct3' of github.com:learningequality/ka-lite into nalanda-rct3

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turn all assertTrue calls in coachreport_tests.py into assertEqual to make the errors clearer
fix test and exercise ids
fix test table indexing due to changes in tests