[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:  closed                               
  Priority:  Normal            |   Milestone:  MacPorts 1.8.0                       
 Component:  base              |     Version:  1.7.0                                
Resolution:  fixed             |    Keywords:  version                              
      Port:                    |  
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Comment(by jmr@…):

 Added back the dp_version file in r53664 so that people trying to
 selfupdate really old versions will get a useful error message (telling
 them to install 1.7.1 first).

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Ticket URL: <http://trac.macports.org/ticket/17420#comment:5>
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