[Commits] [Einstein Toolkit] #57: holdingpattern should not be a required key

[Einstein Toolkit]

#57: holdingpattern should not be a required key
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  Reporter:  hinder      |       Owner:  mthomas
      Type:  defect      |      Status:  new    
  Priority:  minor       |   Milestone:         
 Component:  SimFactory  |     Version:         
Resolution:              |    Keywords:         
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Comment (by eschnett):

 This applies not only to holding pattern, but to all other keys in the
 "simulation" section as well.

 On the other hand, checking for the presence of keys only when they are
 required complicates debugging, as e.g. the consistency of keys necessary
 for mpirun would only be checked once the simulation starts after waiting
 in the queue. Many keys also have default values, and missing keys are
 then difficult to detect.

 What we should have instead is a way to specify whether a machine supports
 building, or running, or archiving, and these keys should then only be
 required if that is the case. If the machine does not support an activity,
 an error should be emitted early.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/57#comment:1>
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