Neume

Copperbox revision 1222.

More work towards overlays in LilyPond - a prototype is in place that generates LilyPond code, however it generates bad code. The code has a trivial problem that it doesn't yet use the parallelMusic command which I discovered recently. It also has a serious problem that parallelMusic doesn't work well with repeat symbols - I didn't know this until I started hand editing the generated code to make it print.