EDIT

fix #7144 Add area level to countries

ref #6752 implement verbatimDate for Reference (Parser and Formatter still missing)

fix TimePeriod hashCode

cleanup

ref #6720 make individualCount a string

cleanup

ref #7096 add symbol2 to xmltype

ref #7238 adapt xmltype for familyName and givenName

ref #6581 preliminary revert some changes for making nomenclaturalReference an OriginalSource

ref #6581 add TaxonName.nomenclaturalSource_id and adapt constructor visibility for DescriptionElementSource