This properly updates sources for inclusion also when adding/removing
them for alarms, while the previous behaviour listened only for source's
enabled/disabled/added/removed notifications, which was not correct.

Related to bug #739955, where is also a little explanation [1] what led
to this change.

[1] https://bugzilla.gnome.org/show_bug.cgi?id=739955#c22

This way one can "duplicate" an event in the calendar. Move To Calendar
still requires the source and the destination calendars being different.

Antoine Jacoutot authored May 30, 2017 and Milan Crha committed May 30, 2017

The warning was:
warning: "HAVE__NL_MEASUREMENT_MEASUREMENT" is not defined

The SIGQUIT behaves like a crash and coredump can be stored even though
it's not a real crash. The factories and other tools handle SIGTERM gracefully,
thus it's the right signal to use, not SIGQUIT.

Марко М. Костић (Marko M. Kostić) authored May 27, 2017 and Administrator committed May 27, 2017

(cherry picked from commit 3402c3f7)

libical supports ICAL_FILENAME_PARAMETER since 2.0.0. It's part of
an extension which sets filename for attachments, thus even inline
attachments keep their original filename.