[MacPorts] #15514: reinplace should warn if nothing got replaced

[MacPorts]

#15514: reinplace should warn if nothing got replaced
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  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:  MacPorts Future
 Component:  base          |    Version:  1.6.0
Resolution:                |   Keywords:
      Port:                |
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Comment (by ryandesign@…):

 We (well, I) seem to have forgotten comment:10.

 My plan was to commit just enough of the patch to introduce the `-q` flag
 and make it do nothing at all. Then wait until a version of MacPorts is
 released supporting that do-nothing flag. Then commit the rest of the
 patch to make reinplace actually print the warning and have `-q` suppress
 it. Then we can start adding `-q` to portfiles and portgroups where
 needed, without having the currently-released version of MacPorts issue an
 error about an unknown `-q` flag.

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Ticket URL: <https://trac.macports.org/ticket/15514#comment:19>
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