[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 2.5.0
Component:  base         |    Version:
 Keywords:               |       Port:
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 The work for this is in the gsoc17-migrate branch. Finish the work on the
 branch and merge the changes into master.

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