Comment (by Michal Pirog):

It is an initial data reader. I believe we need to provide a sample of the initial data to be read, interpolate onto the Cactus grid, and start the Cactus evolution. There are three files, weighing up to 80MB (in the lowest resolution version). My intention was to upload them to the "DNSdata/test/" directory. What do you think?

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2747/inclusion-of-sgrid-importer-in-einstein