[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:  stromnov@…
      Type:  enhancement       |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:
      Port:  vtk               |
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Comment (by mschamschula@…):

 It seems that the default variant for python has been switched from
 python27  to python35. I had to specify

 {{{port install vtk +python27 -python35}}}

 to upgrade my existing install of vtk

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Ticket URL: <https://trac.macports.org/ticket/51020#comment:4>
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