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runahead limit is counter-productive and unnecessary #240

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@ceblanton

Cylc has a built-in required limiter called the runahead limit, which specifies the number of cycle points that will spawn ahead of the oldest incomplete task.

https://cylc.github.io/cylc-doc/stable/html/user-guide/writing-workflows/scheduling.html#runahead-limiting

The purpose of this feature is to prevent cylc from spawning absurd numbers of jobs that would overwhelm resources.In our workflow, we require a start and end date, so unlimited cycle points in the future are not possible.

Currently, we have the limit set to 20 for no reason:

https://github.com/NOAA-GFDL/fre-workflows/blob/main/flow.cylc#L116

So let's set the runahead limit to 99999 to essentially disable it.

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