The issue is that presync-only does not work because CarpetX errors out when it cycles time levels if those levels are not valid everywhere. The PR adds a check to see whether presync-only is active and calls Sync if it is needed.

PR: https://github.com/EinsteinToolkit/CarpetX/pull/328

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2856/carpetx-carpetx-errors-out-when-it-cycles