nsf.c: - change name of enumeratorConverterEntry to Nsf_EnumeratorConverterEntry, move it with NSF_ARG_* flags to tcl.h to make it available in derived modules using the converter - Added editor hints for a more uniform appearance
- made linearization monotonic (for multiple inheritance) via single-inheritance linearization merging while preserving overall linearization rules - added flag NSF_LINEARIZER_TRACE - extended regression test
