fixed events add/edit showing un/select all groups buttons

The buttons were being shown even though survey was selected
for the event template type.
new system stest for moving students

This system test tests the new feature where instructors, admins,
and super admins can move a student from one course to another
along with their survey submissions.
fixed link to the User Doc from the help
system test for manually enrolling a student

When a student already exists in the system, the user can enrol
the student via a link that appears along with the duplicate
username warning. This new minor feature is being tested in this
test.
Merge branch 'dev' of github.com:ubc/iPeer into dev