[MacPorts] #39897: Add 'optional' or 'recommended' metadata tags to portfile spec.

[MacPorts]

#39897: Add 'optional' or 'recommended' metadata tags to portfile spec.
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  Reporter:  c.herbig@…   |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by egall@…):

 Replying to [comment:4 ryandesign@…]:
 > I like the idea of allowing ports to recommend additional ports. I can
 think of numerous places where this could be employed. mysql55 could
 recommend installing mysql55-server. php55 could recommend installing
 php55-apache2handler. graphviz could recommend installing graphviz-gui.

 Also along these lines, Python could recommend installing py-tkinter and
 py-gdbm ^(this recently came up in IRC because a user had installed
 python33 and was confused why IDLE wasn't starting)^, and qt4-mac could
 recommend installing one of the qt4 database plugins ^(like the sqlite3
 one: see #39803 for more on that)^.

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Ticket URL: <https://trac.macports.org/ticket/39897#comment:14>
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