Pull request is here https://bitbucket.org/eschnett/carpet/pull-requests/26/carpet-add-current-walltime-to-timing/diff

This helps correlating events on a cluster for which a timestamp is available with actions (and iteration numbers) in Cactus similar to adding a timestamp to `CCTK_VInfo` output (which Cactus can already do).

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2267/carpet-add-current-walltime-to-timing