[MacPorts] #44056: grass: upgrade to 7.0.0

[MacPorts]

#44056: grass: upgrade to 7.0.0
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  Reporter:  mojca@…  |      Owner:  macports-tickets@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  grass    |
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Comment (by mojca@…):

 Default python is not 2.7 for a reason: py27-wxpython-2.8 conflicts with
 py27-wxpython-3.0. Once we switch to py27-wxpython-3.0, life will get
 easier.

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Ticket URL: <https://trac.macports.org/ticket/44056#comment:9>
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