[mpas-developers] COMMIT CHECK: 'file' option for restarts

[Doug Jacobsen]

Hello All,

This commit check is intended to add the ability for config_start_time to
be set to 'file'. In order for this to work, whenever a restart file is
written, the time stamp is written to a file named 'restart_timestamp'.
When using 'file' for the start time, the time stamp is read from this file
prior to reading in a restart, and is used when determining when the run
should start from.

The attached files provide the framework required for this task, along with
a working implementation in the current ocean core.

>From my tests, the framework changes don't break anything in any other
cores. But the other cores will need modifications (which I could make)
before the file option will work.

I would like to commit these by the end of the week. So any
comments/questions are welcome. If someone wants to test it with a
different core, I can help make the changes needed to make it work in that
core and send out a modified file for it.

Thanks,
Doug
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