[MacPorts] #51310: ImageMagick: update to 7.x

[MacPorts]

#51310: ImageMagick: update to 7.x
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  Reporter:  mopihopi     |      Owner:  ryandesign
      Type:  update       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  ImageMagick  |
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Comment (by diekhans):

 This workflow is suggested because this project seems stuck because it is
 bigger than one person can do.   This would allow other people to help.

 If the entire tree can be converted to v7, is there any reason to maintain
 v6 as well?

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Ticket URL: <https://trac.macports.org/ticket/51310#comment:71>
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