[MacPorts] #38761: RFE: add a `--conflicts` flag to `port info`

[MacPorts]

#38761: RFE: add a `--conflicts` flag to `port info`
-------------------------+--------------------------------
 Reporter:  egall@…      |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:  2.1.3
 Keywords:               |       Port:
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 `port help info` lists the following flags available for `port info`:
 {{{
 --category --categories --depends_fetch --depends_extract --depends_build
 --depends_lib --depends_run --depends --description --epoch --fullname
 --heading --homepage --index --license --line
             --long_description --maintainer --maintainers --name
 --platform --platforms --portdir --pretty --replaced_by --revision
 --subports --variant --variants --version
 }}}
 This covers most of the fields normally displayed by `port info`, however,
 it doesn't look like there's one for the `conflicts` field. It'd be useful
 to have a `--conflicts` flag for `port info` to make it easier to use in
 scripts in which one might want to know what ports a given port conflicts
 with. It could also have the command `port conflicts` as an alias or
 something.

 (I think I might have brought this up in irc before, but I forget if it
 was this or something else...)

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Ticket URL: <https://trac.macports.org/ticket/38761>
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