[MacPorts] #18521: Support extracting .7z archives using p7zip

[MacPorts]

#18521: Support extracting .7z archives using p7zip
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 Reporter:  ryandesign@…             |       Owner:  ryandesign@…           
     Type:  enhancement              |      Status:  new                    
 Priority:  Normal                   |   Milestone:  MacPorts 1.8.0         
Component:  base                     |     Version:  1.7.0                  
 Keywords:                           |        Port:                         
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 It would be nice if MacPorts base could automatically handle distfiles
 compressed in the .7z format, using a new "use_7z" setting.

 r46869 inspired this request.

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Ticket URL: <http://trac.macports.org/ticket/18521>
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