removed csv summary from evaluations export
modified evaluations export in csv format

The feature has been modified to include evaluation details
that have evaluators and evaluatees that are no longer in the group.
This is similar to what was done in the results view. The names
of the students that are no longer in the groups are marked
with an asterisk.
added more tests to course system test

I have added more corner cases and error checking cases to the
system addCourse tests.

I have also fixed a bug in events edit when we unselect all the
groups, the change would not be made.