Revision 1766

Made major modifications to user interface on Instructor/Index page.

Added use of getAllUserProblems in main loop for Stats.pm problems when displaying
statistics for a given set.  This speeds GDBM from 8 sec to 2.  SQL stays at around 22-23 seconds.

Also addded code to sort_method which checks that the number of attempts has been defined.
If not it returns 0.

--Mike