[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 fw@…):

 Given that Grass 7.0 is still considered beta, and that it involves some
 file format changes (admittedly with conversions available) as well as
 many user-visible changes, it's probably premature to consider this an
 "update" to the existing 6.4-based port.  Thus, I'd suggest something like
 "grass-beta" for now.

 Meanwhile, it wouldn't hurt to update the existing port to 6.4.4 on
 general principles, though that may not help the GUI issues.

 It also might be worth considering bumping the default Python variant to
 2.7.

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Ticket URL: <https://trac.macports.org/ticket/44056#comment:7>
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