Add Rendezvous support to "add printer" wizard

[Jakub Stachowski]

Hello,

Attached patch allows "add printer wizard" to automatically find network 
printers supporting Rendezvous protocol and detect name, queue, location, 
description and proper drivers. It relies on kdnssd library - it is not in 
kdelibs yet but i think it will be soon (see thread 
http://lists.kde.org/?l=kde-core-devel&m=110192041026735&w=2). 

Following things are not done yet: 
 - capabilities - i'm not sure if it does  makes sense anyway - all these are 
in PPD
- multiqueue printers
- "priority" - for printers that announce support for several protocols (for 
example LPD and IPP) several entries will be displayed instead of selecting 
preferred one
- printer can specify list of accepted mimetypes - how it should be used?

This patch adds listbox with found printers (updated in real time) under list 
of backends. I don't think it is so good, but i don't know kdeprint too well 
and it was best i could come up with for now. Comments will be very 
appreciated.
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