Non-supported endpoints

[arthurrump]

These are used in the official app:

• /departmentsofbranches: subjects, profiles etc. per department.
• /branchesofschools: get all branches of a school.
• /schoolsinschoolyears: get all year schedule projects.

There are no plans for implementing these. Please add a comment if you need one of these, or if you've discovered a new endpoint.