gnus-icalendar.el (gnus-icalendar-event--decode-datefield)
(gnus-icalendar-event-from-ical): Fix timezone handling in
gnus-icalendar export to org.
Add a changelog entry for the revision <9d32270f9a6036a0a694150e8c00201dc20b3519>
Fix for gnus-icalendar handling of empty appt locations.

* gnus-icalendar.el (gnus-icalendar--format-summary-line)
(gnus-icalendar-event->org-entry)
(gnus-icalendar--update-org-event)
(gnus-icalendar-event->gnus-calendar): Fix empty location handling.
gnus-icalendar can update org entry for canceled appointments.

* gnus-icalendar.el (gnus-icalendar-event:sync-to-org)
(gnus-icalendar-event:inline-org-buttons): Allow for appointment
cancellations to be synced to org if the original appt has an org
outline.
gnus-icalendar.el (gnus-icalendar-event->gnus-calendar, gnus-icalendar-event-from-ical, gnus-icalendar-event->org-entry, gnus-icalendar--update-org-event): Required/optional participation, list of attendees synced to org