Group Presence Period repeat only for the duration of the Group Calendar Assignment
We should be able to configure a group calendar saying that the pattern is "from 9:00 to 12:00, repeat every monday morning" with a group calendar assignment saying "use this pattern from 01/01/2016 until 31/12/2016" and then create another group calendar assignment for 2017 without having to change the periodicity stop date on all presence periods of the group calendar.
I think it should repeat from group calendar assignment's start date until min(group calendar assignment's stop date, presence period's periodicity stop date).