[MacPorts] #64297: Allow "." as synonym for current port directory

[MacPorts]

#64297: Allow "." as synonym for current port directory
-------------------------+--------------------
 Reporter:  ryandesign   |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:  2.7.99
 Keywords:               |       Port:
-------------------------+--------------------
 Many shell commands use `.` to indicate the current directory. I often run
 commands like `git add .` or `git commit .`. It's only natural that from
 time to time I also end up trying to run `port` commands with `.`, such as
 `port lint .` but this currently gives an error:

 {{{
 Error: Port . not found
 }}}

 Might we allow `.` to indicate the current directory? MacPorts already
 operates on the current directory when no port name is specified, but
 since `git` defaults to operating on the entire clone rather than the
 current directory, I am now in the habit of specifying `.` on commands.

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Ticket URL: <https://trac.macports.org/ticket/64297>
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