[MacPorts] #53851: Add target that bumps version and checksum

[MacPorts]

#53851: Add target that bumps version and checksum
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  Reporter:  l2dy         |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by l2dy):

 In the first use case I'd bump the version manually and let port(1) update
 the checksum.

 Take R for example, it's not possible to automate the version bump, but
 the checksum could be automatically updated.

 {{{
 set major 3
 set minor 3
 set point 3
 version                     ${major}.${minor}.${point}
 }}}

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Ticket URL: <https://trac.macports.org/ticket/53851#comment:4>
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