Add absences

[jeriox]

As a user, I want to have a view where I can manage my absences (e.g. holidays). I want to be able to enter new absences (start date, end date, maybe reason?) as well as delete wrong ones. I expect the system to not send me mails about events in my absence. As a planner, I expect the system to list absent users apprporiately in the disposition view,