EDIT

ref #8651 first base classes for unified description aggregation and move SDD aggregation from service to new class

Fix class cast for streams in aggregation

cleanup

ref #8450 Display StateData.count if present

minor refactoring

ref #8450 Set "count" when aggregating StateData

some cleanup for TransmissionEngineDistribution

cleanup

ref #8450 Fix potential NPE

ref #8450 Recurse through parent taxon nodes for default description