Enable clustering as a component of dials.combine_experiments.
Enable clustering as a component of dials.combine_experiments.

Parameters to dials.combine_experiments now include options for
clustering by unit cell. Use clustering.use=True to enable. Other
parameters clustering.max_crystals and clustering.max_clusters control
how many experiments are accepted for clustering and how many clusters
are produced. clustering.threshold controls the granularity of the
sorting. If output.max_batch_size is specified, batching occurs after
clustering.

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