[ET Trac] [Einstein Toolkit] #1081: Add index file support for sliced output to CarpetIOHDF5

[Einstein Toolkit]

#1081: Add index file support for sliced output to CarpetIOHDF5
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 Reporter:  hinder       |       Owner:  eschnett
     Type:  enhancement  |      Status:  new     
 Priority:  minor        |   Milestone:          
Component:  Carpet       |     Version:          
 Keywords:               |  
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 CarpetIOHDF5 has support for writing an "index" file alongside the normal
 HDF5 output files.  This is an HDF5 file in which the datasets are present
 but contain no data.  This index file is much faster to read than the full
 HDF5 file (due to locality of data in the index file and block reads on
 slow filesystems) and can significantly speed up analysis of the data.

 Index files are currently written for the "standard" (typically 3D) data
 in Output.cc, but are not written for the "sliced" data in OutputSlice.cc.
 Since visualisation of 2D data is very common, OutputSlice.cc should be
 modified to output index files as well.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1081>
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