We have introduced this task a long time ago without any
release. In the meantime there might be people who have deployed,
hence have selected schedules already. Happened to openSUSE.
For the schedule versioning in the admin interface (having multiple possible shcedules) we need to change some models and associations. It has also been create a rake:move_events_attributes task to migrate the data.
User Interface addapted to make use of the introduced associations and models
