[MacPorts] #51020: vtk: update to 7.0.0 and add python35 variant

[MacPorts]

#51020: vtk: update to 7.0.0 and add python35 variant
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 Reporter:  samuel.bateman@…  |      Owner:  macports-tickets@…
     Type:  update            |     Status:  new
 Priority:  Normal            |  Milestone:
Component:  ports             |    Version:  2.3.4
 Keywords:                    |       Port:  vtk
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 VTK version 7.0.0 has been released and includes support for Python 3,
 which is very useful.

 I've attached a Portfile for the new VTK version 7.0.0 and a variant for
 python35.  (Slightly modified Portfile from the existing one for version
 6.3.0.)

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Ticket URL: <https://trac.macports.org/ticket/51020>
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