Extend manager email possibilities in user-reminder
In user-reminder, the email used for a user is mail, fdPrivateMail or supannAutreMail. But for the manager only mail is looked for.
Inspired by #5754 (closed)
For the user fields are checked in that order and the first non-empty one is used. For the manager only mail is looked for.
Maybe other fields should be checked for manager as well? Maybe for users the order or fields should be in the settings?
Step by step description of new behaviour
Not decided yet
Complex email setups
Too complicated behavior/Settings screen?