Type-aware folder management/listing for Kolab

Author: Aleksander Machniak <machniak@kolabsys.com>

1. About.
---------

The plugin extends folders handling with features of the Kolab Suite.
With this plugin enabled it is possible to:
 - set/get/change folder's type
 - filter folders list by folder type.

http://www.kolab.org/doc/kolabformat-2.0-html

2. Examples.
------------

To get list of all folders of type 'events' use code:

$RCMAIL->imap->list_mailboxes('', '*', 'events');

Plugin provides also set_folder_type/get_folder_type methods.