[ET Trac] [Einstein Toolkit] #1554: Want to define constants in parameter files

[Einstein Toolkit]

#1554: Want to define constants in parameter files
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  Reporter:  eschnett     |       Owner:  sbrandt            
      Type:  enhancement  |      Status:  assigned           
  Priority:  major        |   Milestone:                     
 Component:  Cactus       |     Version:  development version
Resolution:               |    Keywords:                     
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Comment (by rhaas):

 If we keep the variables directly in the flesh I would keep the '$'
 prefix. This makes it possible to use variables in strings as well (in
 particular [hint hint] if we also support ${varname} or $(varname) the way
 the shell or make do), eg as out_dir = "$var-output" or out_file =
 "${var}iable.asc".

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1554#comment:17>
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