EDIT

ref #7980 fix aggregation for titleCache of reused descriptions

ref #7980 fix aggregation for measurement units (still open are not equal units)

ref #7981, ref #7980, ref #8871 explicitly defined source modes for aggregation configurators

ref #8871, ref #7980 handle aggregation source mode TAXON for toParent

ref #8871, ref #7980 handle aggregation source modes for SDD aggregation

ref #8871, ref #7980 adapt available source modes for DDS aggregation

ref #8871, ref #9331 fix DescriptionElementSource.clone , e.g. for DistributionAggregation

cleanup

cleanup and minor

ref #7980 delete not needed descriptions after aggregation