Removed the user accuracy table.
Fused the user_accuracy and grades tables, and simplified the navigation.
Improved navigation.
Another improvement to navigation.
More navigational improvements.
More navigation.
More navigation!
Navigation.
Removed bug with raters are submitters.
Minor change to task display.
Made rating/task_index more efficient wrt db
More navigation and UI fixes.
Minor fix.
Some fixes to the submission file.
Cleanup in ranking and submissions.
Some minor cleanup.
Fixed the update date of submissions.
Closed the user_signature loophole.
Fixed comparisons; now only the last one is valid in the db.
Fixed some small optimizations in the reputation system.