[MacPorts] #56019: Support automatic migration between OS releases using 'port migrate'

[MacPorts]

#56019: Support automatic migration between OS releases using 'port migrate'
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  Reporter:  neverpanic   |      Owner:  neverpanic
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:  MacPorts 2.6.0
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Changes (by neverpanic):

 * milestone:  MacPorts 2.5.0 => MacPorts 2.6.0


Comment:

 I wanted to get this into 2.5.0, but it's not happening due to time
 constraints. We'll try 2.6.0 and see if we can get that out before the
 next OS update.

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Ticket URL: <https://trac.macports.org/ticket/56019#comment:1>
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