[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:  assigned               
 Priority:  Normal                   |   Milestone:  MacPorts 1.8.0         
Component:  base                     |     Version:  1.7.0                  
 Keywords:                           |        Port:                         
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Comment(by ryandesign@…):

 Replying to [comment:2 jmr@…]:
 > Would it be more appropriate to call it "use_7zip", to match use_bzip2
 which has the name of the format rather than the file extension?
 I'm open to changes, but according to the 7-zip web site,
 [http://www.7-zip.org/7z.html 7z is the name of the format]. See also the
 [http://en.wikipedia.org/wiki/7z 7z WikiPedia page].

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Ticket URL: <http://trac.macports.org/ticket/18521#comment:3>
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