-added classes Grouping, NameMapper, PhysicalComponent, Tech and Transform
as implementation of the PyCell API
-introduced constructor overloading using python3 singledispatchmethod
-implemeted PyCell API methods clone(), destroy(), moveBy() and transform()
for the shape-based classes
-takeover json-based technology parameter from original techfile export
-added read-out technology dependent database unit parameter
-added support for sealring (interim release, not error-free!)
-updated documentation