[MacPorts] #20157: add `replaced_by` portfile key

[MacPorts]

#20157: add `replaced_by` portfile key
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  Reporter:  jmr@…             |       Owner:  jmr@…           
      Type:  enhancement       |      Status:  closed          
  Priority:  Normal            |   Milestone:  MacPorts 1.8.0  
 Component:  base              |     Version:                  
Resolution:  fixed             |    Keywords:                  
      Port:                    |  
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Changes (by jmr@…):

  * status:  new => closed
  * resolution:  => fixed
  * milestone:  => MacPorts 1.8.0


Comment:

 r54378

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Ticket URL: <http://trac.macports.org/ticket/20157#comment:1>
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