Chorale: `createPitchClassSet` translated.
Chorale: Fix bug in `getOnSetNotes`. Now returns also the first note.
Chorale: Implement `createCompleteDatabase` as a fold.

The type 'Database' collects the data that the original stores in mutable variables.
Chorale: `session-output.txt` records an interpreter session with the original Macintosh Common Lisp code. Useful for understanding corner cases and function specification.
Chorale: `createCompleteDatabase` now also includes the last beat, which has an empty `destinationNotes` list.
Bookmark -- a full list of MIDI Bach chorales, both in MIDI and PDF format.
Example Bach chorale BWV 2.6 in Lisp format.

Module `ReadCope` includes new function `readLispNotes` that can read the corresponding data file.
Chorale: Read Bach example from file.
Chorale: Translation of `removeNils` (which seems to be unused.)
Chorale: Maintenance. Move some todo items to done.
Chorale: Translate `incfBeat`. Ouch.