[Pidgin] #5649: Add "list" command for xmpp conversation

[Pidgin]

#5649: Add "list" command for xmpp conversation
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  Reporter:  nops   |       Owner:  deryni      
      Type:  patch  |      Status:  new         
  Priority:  minor  |   Milestone:              
 Component:  XMPP   |     Version:  2.4.1       
Resolution:         |    Keywords:  list command
   Pending:  0      |  
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Comment (by deryni):

 Please do, also try to make the error message for people still trying to
 use the 'old' format as clear as possible (possibly including the help
 message for the command).

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Ticket URL: <http://developer.pidgin.im/ticket/5649#comment:4>
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