EDIT

cleanup

avoid NPE and fix closing of obsolete editors when deleting classification

cleanup

cleanup

fix #9078 finally switch to new deduplication handling (but keep old code until fully reviewed)

rename CdmCacher to CdmCacherBase

cleanup

ref #9071 use ExtendedTimePeriodFormatter in DescriptionHelper and improve formatting for CategoricalData

cleanup

fix possible concurrent modification exception