ref #7095 Move specimen and description loading to service layer
ref #7095 Refactor RowWrapper
ref #7095 Fix potential NPE
ref #7095, #7086 Check classification uniqueness of sub tree filter
ref #7095 Add javadoc
ref #7095 Extract row comparator to own class file
ref #7095 Limit node hierarchy by maxRank of corresponding working set
ref #7095 correctly sort tree hierarchy via taxon nodes sort prefs
ref #7095 Refactoring