[ET Trac] [Einstein Toolkit] #1359: add "read from file" option ot HydroBase's initial_data options

[Einstein Toolkit]

#1359: add "read from file" option ot HydroBase's initial_data options
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 Reporter:  rhaas                  |       Owner:     
     Type:  enhancement            |      Status:  new
 Priority:  minor                  |   Milestone:     
Component:  EinsteinToolkit thorn  |     Version:     
 Keywords:  HydroBase              |  
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 the attached patch adds a value "read from file" to HydroBase's
 initial_XXX options. This makes it possible to use IOUtils file reader
 with hydro data.

 This is somewhat similar to IDFileADM's extension of ADMBase's options,
 only we do not have to set any grid scalars.

 Needed to be able to reproduce the MHD paper's collapse test since
 Whisky_RNSID is not public.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1359>
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