[MacPorts] #63652: upgrade ImageMagick to 7.1.0

[MacPorts]

#63652: upgrade ImageMagick to 7.1.0
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  Reporter:  diekhans                 |      Owner:  (none)
      Type:  update                   |     Status:  new
  Priority:  Normal                   |  Milestone:
 Component:  ports                    |    Version:
Resolution:                           |   Keywords:  ImageMagick
      Port:  ryandesign at macports.org  |
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Comment (by diekhans):

 Note that ImageMagick has moved all its commands to subcommands of a new
 magick command.  It should be possible to install 7.* along side of 6.*

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Ticket URL: <https://trac.macports.org/ticket/63652#comment:1>
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