The max attempts setting for a problem xblock should be set to null for
course default max attempt setting to take effect. This makes sure that
xblock setting is updated if course default is updated.
This Ticket adds three new settings widgets to the Problem Editor:
Randomization: This is a setting for advanced problems only which deals with python scripts.
General Feedback: This is feedback which is only applied to certain problem types for mass-adding feedback to incorrect problems.
Group Feedback: For certain problems, the user can provide specific feedback for a combination of specific answers.
