Ticket #166

fixed the logic that restricted TAs from seeing full names
simplified the filter function in evaluation results

- We no longer have a drop down filter for criteria, therefore I have
simplified the function to only check the author of the comments.
Ticket #162 - reports / course screen

- For the statistical participation report, I have fixed it to show
the number of evaluations completed as the number of judgements divide
by number of criteria
- For the Course screen I have refactored the evaluations count hybrid
property and added a hybrid property to count the number of self-evaluations
submitted.