Throwing out an earlier question

[alopezlago]

Repro steps:

1. Start a new game
2. Mark a correct buzz for the first question
3. Mark a correct buzz for the second question
4. Go back to the first question and throw it out
   Expected:
   Either a warning saying that it can't be done, or it picks the next available question.
   Actual:
   All answers are moved to the next question, which means all of the buzzes are wrong.

I don't think this should be happening too much, but it has happened before. The warning approach is easy to do though frustrating for the reader, and the "pick next available" approach is harder and might break backwards compatibility if we're not careful.

[alopezlago]

The "pick next available" approach has lots of pitfalls (handling future thrown out questions, handling paired tossups/answers), and fixing this likely won't work without an overhaul of how questions are thrown out (#212)