EDIT

cleanup

cleanup

ref #9539 implement base classes for available for and some first methods

minor

ref #9541 utitlity method for KeyStatement

ref #9541 improve handling for description main objects

ref #9331 correct modelling for DescElem to Source and update script for DescElemSources

ref #9331 some final changes in model for NamedSourceBase et al.

ref #9331 add NamedSource and NamedSourceBase and use it, SecundumSource inherits from NamedSource

ref #9331 remove generics from OriginalSourceBase