SLanguage: potential NPE and explain, why we care about 'GeneratesInto' in this likely inappropriate location.
Javadoc: LanguageRuntime aspects
Interpreted languages: make all our descriptors to come with new methods (consistency, and ConceptDescendantsCache doesn't do own model walk)
InterpretedConceptDescriptor: access properties by id, use correct properties (there are no isAbstract, isFinal properties in the concept node)
MetaIdByDeclaration: use openapi.SNode instead of smodel.SNode
Introduce support for explicit bootstrap meta-objects to facilitate exception-free start of clean MPS itself