EDIT

fix #6790 IO class hierarchy creates problems in eclipse

rename ExcelImporterBase to ExcelImportBase

minor

the needNomenclaturalCode() method has to be in the import class

ref #6524, ref #6619 set needsNomenclaturalCode to false for ExcelDistributionUpdateConfigurator

minor

ref #6524 add reporting to distribution updater

ref #6524 add reuse existing distribution

ref #6524 add import source to ExcelDistributionUpdate

ref #6524 first running version of (FauEu) distribution updater