Bala

Copperbox revision 194.

I've added a new representation Score. This is an experiment to see whether it makes rendering simpler.

Score is an explicit intermediate form (like GHC's core or Yhc.Core). My idea is that it will be easier to render to this - sort out things like barlines and staff grouping, then render to Abc or LilyPond as a last step hopefully without much processing.


Also added a couple more samples. One is a tab that can be read by the TabApp - TabApp works as a proof of concept unfortunately the ouput isn't pretty.