[Bugs] #1352 HIGH: Prevent creating parent-less dialogs

[SugarLabs Bugs]

#1352: Prevent creating parent-less dialogs
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    Reporter:  alsroot      |          Owner:  tomeu      
        Type:  enhancement  |         Status:  new        
    Priority:  High         |      Milestone:  0.86       
   Component:  sugar        |        Version:  0.85.x     
    Severity:  Unspecified  |       Keywords:             
Distribution:  Unspecified  |   Status_field:  Unconfirmed
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 After moving to metacity we have many issues due to the fact that activity
 authors do not pass parent while creating ObjectChooser object(for
 example).

 It could be useful for ObjectChooser to make parent argument required(it
 could be None) for 0.88 and add deprecation warning for 0.86 or do some
 smart job to autoset parent on shell side.

 Also parent argument could be required for sugar.graphics.Window(w/
 warning in 0.86) or new Dialog class.

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Ticket URL: <http://dev.sugarlabs.org/ticket/1352>
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