Add caching to experiment results to speed repeated analysis #1331
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This merge introduces file based caching / serialization of experiment results within each experiment's run directory. These are then read in (if they are not invalid) instead of re-processing the output files for the experiment.
These caches are invalidated if the timestamp on the cache is older than any other file in the experiment directory, or if the hashes on the objects (i.e. application / modifier / etc) changed relative to the last time the cache was written.
Tests are also added for this.