[MacPorts] #15628: RFE: Enhance port variants

[MacPorts]

#15628: RFE: Enhance port variants
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 Reporter:  raimue at macports.org  |       Owner:  macports-tickets at lists.macosforge.org
     Type:  enhancement          |      Status:  new                                  
 Priority:  Normal               |   Milestone:  MacPorts base enhancements           
Component:  ports                |     Version:                                       
 Keywords:  base variants        |  
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 Inspired by #15625, port variants should display more information:
   * Show default variants
   * Show conflicting variants (`conflicts`)
   * Show variant dependencies (`requires`)

 (Not sure if we already had a ticket for this, couldn't find one.)

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Ticket URL: <http://trac.macports.org/ticket/15628>
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