[MacPorts] #49218: vaucanson: rename to vcsn and update to 2.1

[MacPorts]

#49218: vaucanson: rename to vcsn and update to 2.1
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  Reporter:  akim.demaille@…  |      Owner:  ryandesign@…
      Type:  update           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.3.4
Resolution:                   |   Keywords:  haspatch maintainer
      Port:  vaucanson        |
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Comment (by akim.demaille@…):

 Hi!

 Vcsn 2.2 was released.

 I attached the updated Portfile, and the diff.

 Cheers!

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Ticket URL: <https://trac.macports.org/ticket/49218#comment:9>
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