[MacPorts] #17473: RFE: allow Portfile to upgrade dependents

[MacPorts]

#17473: RFE: allow Portfile to upgrade dependents
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 Reporter:  mcalhoun@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement            |      Status:  new                                  
 Priority:  Normal                 |   Milestone:  MacPorts base enhancements           
Component:  base                   |     Version:                                       
 Keywords:                         |        Port:                                       
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Comment(by mcalhoun@…):

 Attached (force_upgrade.diff) is a diff file against the trunk.[[BR]]
 I also added a poison_revision.

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Ticket URL: <http://trac.macports.org/ticket/17473#comment:6>
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