[Bugs] #1765 UNSP: Changes to a Journal entries metadata are wiped if activity is still open

[Sugar Labs Bugs]

#1765: Changes to a Journal entries metadata are wiped if activity is still open
------------------------------------------+---------------------------------
    Reporter:  erikos                     |          Owner:  sayamindu
        Type:  defect                     |         Status:  new      
    Priority:  Unspecified by Maintainer  |      Milestone:  0.84     
   Component:  sugar-toolkit              |        Version:  0.84.x   
    Severity:  Critical                   |       Keywords:  r?       
Distribution:  Unspecified                |   Status_field:  New      
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 How to reproduce:

 1) Start a new Activity from the home fav view (e.g Browse)
 2) Switch to Journal
 3) Favourite star it, edit the title, in detail view add description
 and/or tags
 4) Switch back to Journal list view (i.e don't leave in Journal details
 view)
 5) Switch to Activity instance
 6) Switch back to Journal view
 7) Note that all previous Journal metadata details are wiped/reset

 Original description in #1358.

 This one cause a lot of confusion and lost data in the Berlin Pilot. I
 ported the 0.88 fix back to 0.84. The only thing I don't like with the
 patch is that we need to create another ds interface in the datastore
 module (we have already one in the dbus-helpers).

 Patch tested on soas-0.84.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1765>
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