[MacPorts] #28844: Preforming an upgrade should remove the older version of a port

[MacPorts]

#28844: Preforming an upgrade should remove the older version of a port
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 Reporter:  vendion@…          |       Owner:  macports-tickets@…                   
     Type:  request            |      Status:  new                                  
 Priority:  Normal             |   Milestone:                                       
Component:  ports              |     Version:  1.9.2                                
 Keywords:                     |        Port:                                       
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 When preforming a upgrade on outdated ports it should remove the older
 version of a port when upgrading to a newer one.  This will cut down on
 unnecessary disk space usage.  Taking Perl for an example there is no
 reason why Perl 5.8, Perl 5.10, and Perl 5.12 is installed at the same
 time.  This is just one of many ports on my system like this.

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Ticket URL: <https://trac.macports.org/ticket/28844>
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