TODO update
Only show flow stats in grade book if a grade comes from a flow
Kill some unused CSS
Kill debug print
Gray out CodeMirror when read-only
Remove debug print
Remove wrong docstring
Minor gradebook button styling fix
Fix unassigned variable access in grading interface
Disallow grading when flow in-progress
Don't obliterate previous grade_data when regrading
Factor out function to get previous answer visit
Only save grade change when grade actually changed
TODO updates
Further doc tweaks
Don't make a grade record if all it'll indicate is that the grade isn't yet available, and no grade came before it
Show localized times in grade log
TODO updates
Add grade recalculation
Don't show flow result comments to students