reply to the organizer of an ical event

reply to the organizer of an ical event

RFC5546 specifies that participant status (accepted, tentative,
declined) should be sent to the organizer of the event.  That
organizer is not necessarily the sender of the invitation; for
instance Google Calendar uses custom email addresses to receive these
notifications.

* lisp/gnus/gnus-icalendar.el (gnus-icalendar-send-buffer-by-mail):
Replace the default recipient of the reply by the organizer of the
event.
(gnus-icalendar-reply) Pass that organizer to the previous function.