Right now all grid variables declared in interface.ccl in CarpetX always have storage turned on. To reduce memory footprint for codes (and just b/c this is the expected behaviour) CarpetX shoud support Cactus' CCTK_StoarageIncrease and CCTK_StorageDecrease and STORAGE: foostatements.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2913/support-enabling-disabling-storage-in