Better way to upload discussion attendance

[kavigupta]

Not sure if this is the right repo to put this on

Currently discussion attendance suffers from a number of problems

• the process takes about 3-4 minutes, which can be somewhat inconvenient
• if you upload to the wrong discussion, there is no way to undo that
• it is difficult to tell if you have already uploaded discussion scores

To solve this, I propose a few different solutions, in increasing order of difficulty to implement / increasing order of usefuleness

1. Have a way to delete scores on ok (i.e., resolve https://github.com/okpy/ok/issues/1327)
2. Have a way to have a "discussion submission" that's a list of names/assignment that can be referred to/modified/deleted arbitrarily. When calculating discussion scores, refer to this model
3. Have a feature where you can share a discussion survey named "'s Discussion <Disc #>" with like discussion@okpy.org and it automatically uploads attendance for you

3 sounds a little too difficult to implement, although I am willing to give it a try sometime this semester.