[MacPorts] #17420: Use only one version file to identify the MacPorts version

[MacPorts]

#17420: Use only one version file to identify the MacPorts version
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 Reporter:  blb@…             |       Owner:  macports-tickets@…                   
     Type:  defect            |      Status:  new                                  
 Priority:  Normal            |   Milestone:  MacPorts 1.8.0                       
Component:  base              |     Version:  1.7.0                                
 Keywords:  version           |        Port:                                       
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Comment(by raimue@…):

 This is especially important if we reach 1.10, as the old format can't
 handle that.

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Ticket URL: <http://trac.macports.org/ticket/17420#comment:1>
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