Instantiate tests in autograding and feedback generation?....

[trevorcampbell]

@Alireza-Iranpour I just realized -- we may need to run instantiatetests when the autograder runs. I am not 100% sure what it does, but I think it replaces test code in the release version with test code from some other version to prevent students from being able to game the notebooks by simply editing the release version test code.

• If it replaces with the source version, we need to do some work -- the source version just has ### AUTOTEST directives, not actual test code
• If it replaces with a newly-generated release version, we should be OK -- the release will have the actual instantiated test code

I have the same concern with the manual grading and feedback generation stages as well.