Addd a few small things to gateway.template
- set debug flag to 0
- the change in having persistant user settings means the old permissions for showing old answers dont really make sense.  I replace the two of them with one which just controls if a student can see old answers or not.
Fixed a bug in rendering essay comments.
Made use of the timeAssignDue and associated config variables in ProblemSetList2.  They didn't make much sense in the WeBWorK 2 menus otherwise.
cleaned up validation of time