[ET Trac] [Einstein Toolkit] #1849: CarpetIOHDF5: fix check for old string datatype

[Einstein Toolkit]

#1849: CarpetIOHDF5: fix check for old string datatype
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  Reporter:  knarf   |       Owner:  eschnett           
      Type:  defect  |      Status:  review             
  Priority:  minor   |   Milestone:                     
 Component:  Carpet  |     Version:  development version
Resolution:          |    Keywords:  hdf5               
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Comment (by knarf):

 I updated the pull request. detect_class was replaced with get_class, and
 a new testsuite was added to test restarting from a new-style grid
 structure string - using the same parfile to creation as the old did.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1849#comment:4>
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