No general comments item at the end

[julia-guo]

Currently, the script supports adding comments to each rubric item, in the following fashion:

student3 30 (A1) nice; (B1.2) wrong wq2 answer; (C2.1) Makes with warnings; (C2.2) great!

However, there is no prompt (at the very end of the script) to write general comments that are not attached to rubric items, e.g. "(A1) nice; ... ; (C2.2) great!; Excellent job overall!".

[hmontero1205]

this will most likely involve editing the format of grades.json to have a top-level field per submission called "general-comments" or something. the more interesting question is when to prompt to enter this field.. the end of each grading question? we also want to be careful not to let the grader unintentionally overwrite older general comments..