[Bugs] #2373 NORM: add support for Object Chooser

[Sugar Labs Bugs]

#2373: add support for Object Chooser
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    Reporter:  sascha_silbe  |          Owner:  silbe            
        Type:  enhancement   |         Status:  new              
    Priority:  Normal        |      Milestone:                   
   Component:  Restore       |        Version:  Git as of bugdate
    Severity:  Minor         |       Keywords:                   
Distribution:                |   Status_field:  New              
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 Reported by the NZ testing team:

 > Basically they worked, though it was a bit confusing that you don't open
 restore and then choose the file on the USB.

 We might also consider accessing external media directly (like we do in
 Backup) to avoid the implicit copy to Journal (#496).

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2373>
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