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Cubicweb 3.27 is not python 3 compatible.
Force the version in tox.

Inheriting from ICalendarableAdapter make sure that all the attributes needed
for the adaptation are properly set up.

The regid is now provided by the parent class, therefore, there is not need to
repeat it.

In particular, this patch fixes the rendering of the Timeperiod's ical view
where the attribut `component` (see [0] line 53) is needed (see [0] line 88) and
was not specified.

A simple test is added. It asserts that the ical view works without any issue
(the same test fails before this patch). The 'vobject' module is added to
dev-requirements list, because it's needed to generate the 'ical' view.

[0]: https://hg.logilab.org/review/cubicweb/file/84937ac5060f/cubicweb/web/views/calendar.py

This allow to modify Daytype titles without needing to adapt the code.
When display_in_user_request is set to True, User will see this choice when creating Timeperiod.

Ok ocy@

The behavior of this test depend on side effect of other tests because of the "daytype_cache".
Ensure clearing the cache before making assertion on get_days_type().

TypeError: int() argument must be a string, a bytes-like object or a number, not 'dict_values'