#6473 NORM Never A: Fix/redesign PS and sugar.presence's tracking of buddy handles

[Zarro Boogs per Child]

#6473: Fix/redesign PS and sugar.presence's tracking of buddy handles
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 Reporter:  morgs             |       Owner:  Collabora     
     Type:  defect            |      Status:  new           
 Priority:  normal            |   Milestone:  Never Assigned
Component:  presence-service  |     Version:                
 Keywords:                    |    Verified:  0             
 Blocking:                    |   Blockedby:                
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 Activities have a get_buddy function which calls Telepathy directly to
 resolve a buddy handle.

 My attempt to provide a buddy-handle cache in sugar.presence didn't work
 well in that once a buddy left, we remove the mapping, although we depend
 on resolving the mapping after the fact for UI purposes ("morgs left the
 chat"...)

 This needs a rethink so that we can replace the activity use of TP
 directly for this, and yet provide what the activity needs.

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Ticket URL: <http://dev.laptop.org/ticket/6473>
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