Currently if the manager goes down in the middle of the execution of a
GApplication, the grid is in an inconsistent state.

Ideal situation is that all objects are restored from persistent storage
(database, currently) on the restart of the Manager and execution is resumed
at the last known good state.  This would require caching on the Manager of
all ModuleDependency and FileDependency data, and the parameters for each
thread which could be reinstantiated and rescheduled.

As far as I know, this can't be/isn't done now, so I'm going to make that
happen.  If I'm wrong, let me know.


Jonathan
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