Fix test detail exam reports
Merge branch 'nalanda-rct2' of github.com:learningequality/ka-lite into nalanda-rct2

Conflicts:
	kalite/coachreports/views.py
More helpful stat display on test view page.
Updates for to fix for tests
Merge pull request #2232 from dylanjbarth/nalanda-rct2

Fix bugs in exam reporting