Suggestions for the grading step

[nthiery]

• Automatically detect empty answers, and mark the question as
  graded with score 0
• display the total score for the question
• display a link to open and update the question metadata #406
• the cross symbol currently used to close is somewhat ambiguous
  with "delete"
• UI/keystroke to jump to next/prev ungraded copie
• Compute (an estimate of) the time spent grading each
  question. During grading, display an estimate of the time used and
  remaining to grade the question, the exercise, the exam. Besides
  being a powerful motivator, and also helps organize the grading
  session, split forces across exercises, decide in advance whether
  another grading session will be required, etc.

[barais]

• UI/keystroke to jump to next/prev ungraded copie
  It exists, ctrl + arrow (left right for sheet) (bottom up for next/previous question.
  -[x] Automatically detect empty answers, and mark the question as
  graded with score 0
  You can now cluster answers. and grade a batch of answer. (You grade the first one and you apply the same grade to the cluster.) UI could be improve.