* input/test/dpncnt.ly:

* input/test/dpncnt.ly:
* input/test/chord-names-dpnj.ly: Resurrect.

* lily/my-lily-lexer.cc: Remove chordnames keyword.

* ly/chord-modifiers-init.ly (ignatzekExceptions): Update, tidy up.

* scm/chord-name.scm (sequential-music-to-chord-exceptions):
Better docstring, add parameter NON-ROOT, tidy up.