[MacPorts] #21615: NLTK Ports upgrade to 2.0b6

[MacPorts]

#21615: NLTK Ports upgrade to 2.0b6
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 Reporter:  stevenbird1@…          |       Owner:  macports-tickets@…                   
     Type:  update                 |      Status:  new                                  
 Priority:  Normal                 |   Milestone:                                       
Component:  ports                  |     Version:  1.8.0                                
 Keywords:                         |        Port:                                       
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Comment(by snc@…):

 py26 complains of overlapping file:
 `/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6
 /site-packages/yaml/__init__.py`

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Ticket URL: <http://trac.macports.org/ticket/21615#comment:1>
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