Taskflow - supervisor on cohort base

[georgmaisser]

This is just a collection of ideas about cohort based supervisors for booking and Taskflow.

in standard adapter, we should have a setting to allow definition of supervisor not only via the user profile filed supervisor.

The other possibility would be to define a supervisor cohort field. A supervisor would have the id of the cohort or cohorts for which she is supervisor.

on Updating the user, we will update all supervisor fields of all the users to make sure they have the right supervisor.

On switching a cohort, we will check if the switching user has the right supervisor.
A cohort switch always sets the supervisor new, if a supervisor is defined.