[Bugs] #701 UNSP: Let user upgrade system activity from .xo

[SugarLabs Bugs]

#701: Let user upgrade system activity from .xo
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    Reporter:  alsroot                    |          Owner:  tomeu      
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.84       
   Component:  sugar                      |        Version:  0.84.x     
    Severity:  Blocker                    |     Resolution:             
    Keywords:                             |   Distribution:  Unspecified
Status_field:  Unconfirmed                |  
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Comment(by alsroot):

 sugar-701.3.patch prevents loading two activities at the same time(one
 system with old version and one newest from ~/Activities)
 anyway this patch should be treated as workaround code for 0.84

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Ticket URL: <http://dev.sugarlabs.org/ticket/701#comment:3>
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