Duplicated exercises in 1.12.1

[danieljin47]

Describe the bug
Duplicates to exercises in section 1.12.1 at https://runestone.academy/runestone/books/published/fopp/GeneralIntro/Exercises.html

To Reproduce
Steps to reproduce the behavior:

1. Go to https://runestone.academy/runestone/books/published/fopp/GeneralIntro/Exercises.html
2. Scroll down to Section 1.12.1
3. See duplicated MC questions

[schweinsbergs]

Working on this for assignment A06.

[bnmnetp]

I think you will find that the duplicated questions are exercises added by other instructors. Often as practice for themselves to learn how to write/edit their own.

What would be nice is make a modification to the code in RunestoneServer that saves questions and if a question matches another question already in the database (except for the identifier) you could reject the question and not allow an instructor to save it.