[Bugs] #315 UNSP: add a way to add new contacts not seen by the PS

[SugarLabs Bugs]

#315: add a way to add new contacts not seen by the PS
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    Reporter:  tomeu                      |          Owner:  marcopg    
        Type:  enhancement                |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.86       
   Component:  sugar                      |        Version:  Unspecified
    Severity:  Unspecified                |     Resolution:             
    Keywords:                             |   Distribution:  Unspecified
Status_field:  Unconfimed                 |  
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Comment(by gdesmott):

 Some comments:
 - imports should be done at the begin of the file

 - there should have UI asking for the identifier to add (instead of
 hardcoding "tomeu-test at jabber.sugarlabs.org")

 - UI should also list the existing TP connections and let the user choose
 the one to which the contact have to be added (instead of taking the first
 connection from conn_watcher.get_connections())

 - You should use the new Requests API. Something like that:
 channel_path, props =
 connection[CONNECTION_INTERFACE_REQUESTS].EnsureChannel(
 CHANNEL_INTERFACE + ".ChannelType": CHANNEL_TYPE_CONTACT_LIST,
 CHANNEL_INTERFACE + ".TargetHandleType": CONNECTION_HANDLE_TYPE_LIST,
 CHANNEL_INTERFACE + ".TargetID": 'subscribe')

 So you don't need to request the subscribe handle any more.

 - You should probably add the contact to the 'publish' contact list too.
 Maybe that should be done once the contact accepted your request but we
 can start like that for now.

 See also https://dev.laptop.org/ticket/8841 where Rob described what
 should be done to properly manager buddy subscriptions.

-- 
Ticket URL: <http://dev.sugarlabs.org/ticket/315#comment:3>
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