Improve stability of error model determination in dials.scale. #1649
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Adds an extra filtering step to remove symmetry groups with abnormally high internal variance, which helps stabilise the error model minimisation.
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This change adds an extra filtering step to remove symmetry groups with abnormally
high internal variance, which helps stabilise the error model minimisation.
This was causing an issue with some less-than-great datasets, where the error model
parameters were not successfully determined, and is fixed with this change. This change
has minimal effect on good datasets as very few groups are typically filtered out.