[MacPorts] #18990: Add py-virtualenv

[MacPorts]

#18990: Add py-virtualenv
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 Reporter:  arthur@…                 |       Owner:  macports-tickets@…                   
     Type:  enhancement              |      Status:  new                                  
 Priority:  Normal                   |   Milestone:  Port Submissions                     
Component:  ports                    |     Version:  1.7.0                                
 Keywords:                           |        Port:                                       
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Ticket URL: <http://trac.macports.org/ticket/18990>
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