Fixed for Kronolith 2.3.5

Thanks!

Changes have been made in CVS for this ticket:

Merge from Git:
ADD is only used when adding new instances to an existing recurring 
event series.
As per RFC 2446, REQUEST should be used when modifying an existing 
event. We currently
don't support adding instances to the existing recurring event series 
via iTip without
sending the entire event series again.
Bug: 9131
Reported By: patrick.abiven@apitech.fr
http://cvs.horde.org/diff.php/kronolith/lib/Kronolith.php?rt=horde&r1=1.263.2.84&r2=1.263.2.85&ty=u

Changes have been made in Git for this ticket:

ADD is only used when adding new instances to an existing recurring 
event series.
As per RFC 2446, REQUEST should be used when modifying an existing 
event. We currently
don't support adding instances to the existing recurring event series 
via iTip without
sending the entire event series again.

Bug: 9131
Reported By: patrick.abiven@apitech.fr

http://git.horde.org/diff.php/kronolith/lib/Kronolith.php?rt=horde-git&r1=90a9aa6cd06eeb00f09baf369f2c087210dc68f8&r2=82a31168b7992db45c239c110f50197c600d7f17

Hello
When rescheduling an existing event, the ITIP message sent to 
attendees contains the method 'ADD'.
Based on RFC 2446, it seems we should use the method 'REQUEST'  (The 
"REQUEST" method may be used to reschedule an event) and not the 
method 'ADD' (The "ADD" method in a "VEVENT" calendar component is 
used to add one  or more instances to an existing "VEVENT".).

We have face this issue when attendees use Thunderbird + Lightning for 
processing ITIP messages from an organizer using Kronolith.

lib/Kronolith.php
  -  $method = 'ADD';
  + $method = 'REQUEST';
     $filename = 'event-update.ics';
     $subject = sprintf(_("Updated: %s."), $event->getTitle());

Regards
Patrick