E3SM-Project / E3SM-Project/scream

Routine that writes atm dag to file should only run on one rank

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bug code cleanup performance
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Description

It is currently run by _all_ ranks, each trying to write the same file. It is buggy at best.

Also, we should plot the "global" layout of a var, not the "on-rank" one. That is, if a layout has the `COL` label, we should make sure its extent matches the _global_ number of cols, not the local (on-rank) one.

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