Feature - Assignment and student results overview

Related to #144

Description

TAs and instructors should be able to see an overview of the performance of students individually and as whole per assignment.

Priority - Medium

Such metrics are very important to assess the performance and progress of the students within in a course. It could also pave a way towards statistic-based fraud detection and can provide useful information about how students reach the desired solution.

Definition of done

• An assignment overview page containing statistics (such as number of students who passed/failed, average scores, etc.)
  • View number of students that have already passed
  • View number of students that pass over time
• A way to single out students or groups to assess their performance on an individual basis
  • View the total number of submissions per student for an assignment
  • View number of pass/fail submissions in pie chart
  • View the student's progression over time span (graph of time vs submission pass/fail)