[Pidgin] #3420: PurpleConvChatBuddy improvements

[Pidgin]

#3420: PurpleConvChatBuddy improvements
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  Reporter:  sadrul     |       Owner:       
      Type:  task       |      Status:  new  
  Priority:  minor      |   Milestone:  3.0.0
 Component:  libpurple  |     Version:  2.2.1
Resolution:             |    Keywords:       
   Pending:  0          |  
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Changes (by resiak):

  * summary:  PurpleChatBuddy improvements => PurpleConvChatBuddy
              improvements

Comment:

 There's an `alias_key` field in PCCB which is never set, which it would be
 nice to lose in 3.0.

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Ticket URL: <http://developer.pidgin.im/ticket/3420#comment:4>
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