[MacPorts] #17894: R port bump to R 2.8.1

[MacPorts]

#17894: R port bump to R 2.8.1
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 Reporter:  kjell.konis@…        |       Owner:  macports-tickets@…                   
     Type:  enhancement          |      Status:  new                                  
 Priority:  Normal               |   Milestone:  Port Updates                         
Component:  ports                |     Version:  1.7.0                                
 Keywords:                       |        Port:  R                                    
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 R was recently upgraded to 2.8.1.

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Ticket URL: <http://trac.macports.org/ticket/17894>
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