UV Institute Separation does not separate Comparison Exams per Institute

When Institute Separation is active, this is not reflected to the comparison exams. They are always available, from all Institutes.

There is a need for a configuration possibility:

1. allow access to all comparison exams independet from Institute

2. restrict access to all comparison exams from different Institutes

3. grant access for Institute A to comparison exams from Institut B but not Institute C etc.