[Bugs] #2157 IMME: reimplement sugar.presence so it doesn't use the Presence Service

[Sugar Labs Bugs]

#2157: reimplement sugar.presence so it doesn't use the Presence Service
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    Reporter:  tomeu          |          Owner:  erikos     
        Type:  enhancement    |         Status:  new        
    Priority:  Immediate      |      Milestone:  0.90       
   Component:  sugar-toolkit  |        Version:  Unspecified
    Severity:  Unspecified    |       Keywords:  r?         
Distribution:  Unspecified    |   Status_field:  Assigned   
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Changes (by erikos):

  * priority:  Unspecified by Maintainer => Immediate
  * status_field:  Unconfirmed => Assigned
  * milestone:  Unspecified by Release Team => 0.90


Comment:

 First of all, thanks for doing that awesome task!

 A few first words while reading:

 - please adjust the copyright in all the files you touch
 - as discussed on irc: the debug logs are ok for now when we do heavy
 testing, I would like to remove them later and/or make them produce more
 accessible data

 activity/activity.py:
 - set_up one word: _set_up_sharing
 - SUGAR_CLIENT_PATH = '/org/freedesktop/Telepathy/Client/Sugar' is unused
 - self._handle.handle_invite: maybe call it 'invited'?

 more to come...

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2157#comment:2>
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