[Bugs] #1659 UNSP: replace Xephyr with VNC

[Sugar Labs Bugs]

#1659: replace Xephyr with VNC
------------------------------------------+---------------------------------
    Reporter:  sascha_silbe               |          Owner:  sascha_silbe     
        Type:  enhancement                |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.88             
   Component:  sugar                      |        Version:  Git as of bugdate
    Severity:  Major                      |       Keywords:  r?               
Distribution:  Unspecified                |   Status_field:  Assigned         
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 We've had enough trouble with Xephyr. This patch replaces it with VNC.

 Uses VNC4 on Debian (derivatives), TigerVNC on Fedora (derivatives). The
 latter one has been fixed upstream (already in F11+F12) w.r.t. the keymap
 bug.

 Tested on:
 - Debian squeeze (for several months)
 - Ubuntu Intrepid
 - Ubuntu Jaunty
 - Fedora 12

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1659>
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