Bug: 12544 Output the CLASS_SMS value like Exchange does.
Remove empty 'birthday' or 'anniversary' fields during Kolab _store(), otherwise Kolab_Format will try to generate date fields and crashes.

Second part of the fix for bug #12506.

Signed-off-by: Thomas Jarosch <thomas.jarosch@intra2net.com>
Signed-off-by: Michael J Rubinsky <mrubinsk@horde.org>
Set default user agent to H5

Signed-off-by: Thomas Jarosch <thomas.jarosch@intra2net.com>
Signed-off-by: Michael J Rubinsky <mrubinsk@horde.org>