majalan

Copperbox revision 3246.

Minor work on Chain rephrasing the troublesome bar parsers. However, Chain (vis parsing) now looks like the wrong abstraction - it just doesn't seem to be a musical abstraction. A rethink is needed.

As a side note, I've missed the essence of TikZ's chains in both Wumpus and currently Majalan. Chains aren't about consumption - stepping through a trail or parsing a beat pattern. They are a way of making a trial not following one.