[MacPorts] #44056: grass: upgrade to 7.0.0

[MacPorts]

#44056: grass: upgrade to 7.0.0
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  Reporter:  mojca   |      Owner:  Veence
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  grass   |
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Changes (by mojca):

 * owner:  macports-tickets@… => Veence
 * status:  new => assigned
 * cc: Veence (removed)


Comment:

 I'm assigning this ticket to Vincent who already created a port `grass7`
 in r142757 and kept updating it.

 Perhaps this ticket could be closed already? Perhaps we should rename
 `grass` to `grass6` (or perhaps better: remove grass6)?

 At some point I would like to get rid of `py-wxpython-2.8` (see ticket
 #46351) and grass 6 is one of two ports that still keep using it.

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Ticket URL: <https://trac.macports.org/ticket/44056#comment:21>
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