Make it possible to submit activities by just having the add_activity permission.
Merge branch 'add-activity-even-if-not-coordinator'
Merge branch 'add-activity-even-if-not-coordinator' into develop
don't create groups and permissions if they are already there.
Merge branch 'management-fixes'
Revert "Merge branch 'management-fixes'"

This reverts commit 4ca590a9094278033b4c5d9037b89e0fafaf4b53, reversing
changes made to 166f16a8083d0dc34e0dc4f35c24f8cd5af56b89.
Merge branch 'master' of https://github.com/osamak/student-portal