[MacPorts] #22374: update: split gromacs into single- and double-precision packages

[MacPorts]

#22374: update: split gromacs into single- and double-precision packages
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 Reporter:  adfernandes@…             |       Owner:  adfernandes@…           
     Type:  update                    |      Status:  new                     
 Priority:  Normal                    |   Milestone:                          
Component:  ports                     |     Version:  1.8.1                   
 Keywords:                            |        Port:  gromacs                 
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 Using the same philosophy as fftw-3 and fftw-3-single, I have split
 gromacs into two components so that both single and double precision
 versions can be co-installed.

 This removes the `double` variant from the original port.

 I have also changed the `nox` variant label to the more standard `no_x11`.

 Compiler dependencies were also changed to `depends_lib` rather than
 `depends_build`.

 Question: how should migration in the variant names be handled? Just leave
 it and, when the port fails to upgrade, the new options can be checked
 out?

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Ticket URL: <http://trac.macports.org/ticket/22374>
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