[ET Trac] [Einstein Toolkit] #1414: add option to IOUtil and CarpetIOHDF5 to read datasets into different variables

[Einstein Toolkit]

#1414: add option to IOUtil and CarpetIOHDF5 to read datasets into different
variables
-------------------------+--------------------------------------------------
 Reporter:  rhaas        |       Owner:                     
     Type:  enhancement  |      Status:  new                
 Priority:  minor        |   Milestone:                     
Component:  Other        |     Version:  development version
 Keywords:               |  
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 Extents the file readers capabilities to not only take a cctk_iteration
 string but also a string alias. I value of
 {{{
 IO::filereader_vars = "hydrobase::vel[0]{alias=admbase::shiftx}"
 }}}
 weill read the datasets admbase::shiftx into the variable
 hydrobase::vel[0]. The idea is to  be able to read variables of evolution
 thorns into postprocessing thorns.

 The IOUtil patch adds the options to the parameter parsing routines and
 the CarpetIOHDF5 patches have CarpetIOHDF5 act on them.

 Consider as a request for comments.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1414>
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