[MacPorts] #15433: RFE: Eliminate duplicates in portlist

[MacPorts]

#15433: RFE: Eliminate duplicates in portlist
---------------------------------+------------------------------------------
 Reporter:  raimue at macports.org  |       Owner:  macports-tickets at lists.macosforge.org
     Type:  enhancement          |      Status:  new                                  
 Priority:  Normal               |   Milestone:  MacPorts base enhancements           
Component:  base                 |     Version:  1.6.0                                
 Keywords:                       |  
---------------------------------+------------------------------------------
 See the following output:
 {{{
 $ port echo name:vim or description:vim
 p5-text-vimcolor
 vim
 vim-app
 vim2html
 p5-text-vimcolor
 vim-app
 vim2html
 }}}

 It should be avoided to list ports twice or more times here.

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Ticket URL: <http://trac.macports.org/ticket/15433>
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