Corrected confusing comments.
Added maintenance script.
Merge remote-tracking branch 'origin/master' into production
Fixed bug: representation does not work for None
Removed the reviewing duties table; still to test.
editing reviews done but not tested
Merge remote-tracking branch 'origin/luca' into mshavlov
Added ability of managers and observers to see the authors of comments.
Added ways to view tasks and comparisons.  The quality of the information needs improving, but at least it's there.
Greatly improved the diagnostic tools.
Removed spurious file.
Made the 0-2000 grade unreadable, to prevent students reading too much into it.
Improved formatting of numbers.
Made the menus more rational.
Better front page.
editing reviews is tested
Merge remote-tracking branch 'origin/luca' into mshavlov
Evaluation ordering using Dirichlet. Various types of annealing added.
More changes to home page.
A function for computing reputation is in.