[MacPorts] #44719: Add port cantera

[MacPorts]

#44719: Add port cantera
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  Reporter:  macports@…  |      Owner:  macports-tickets@…
      Type:  submission  |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.1
Resolution:              |   Keywords:
      Port:  cantera     |
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Comment (by mf2k@…):

 More comments:
  - We don't allow variants to change the version. Instead you should use a
 subport. See the gnuradio port for an example. It has a gnuradio-devel
 subport in the same Portfile.
  - You need to obfuscate your email address: i.e. thomasfiala.de:macports
  - You do not need the following structure:
 {{{
 post-install {
     notes-append
 }}}
 Just replace it with {{{notes}}} and do not have it inside a {{{post-
 install}}} block.
  - Remove the blank {{{pre-destroot}}} block

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Ticket URL: <https://trac.macports.org/ticket/44719#comment:9>
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