Set `date_end_repeat` from `end_repeat`, and unset `end_repeat` for all day events.
Set `date_end_repeat` from `end_repeat`, and unset `end_repeat` for all day events.

All events that have a recurrence rule that doesn't repeat indefinitely
need a `date_end_repeat`. All day events can't have a `end_repeat`. Same
as `starts/date_starts` and `ends/date_ends` fields.

ic-labs/icekit-events,ic-labs/django-icekit,ic-labs/django-icekit,ic-labs/django-icekit,ic-labs/icekit-events,ic-labs/icekit-events,ic-labs/django-icekit