polychords: a working solution

[Jean-Alexis Montignies]

Hi,

For those interested, I've came to a satisfactory solution for me to display 
polychords.

Here's a working code, though to be complete, it would require adding all the 
possibilities in the exceptions. I'll add the specific chords as I'll need them.
As you can see you have to set two variables when you want to use this 
notation, which is done by the macros \cmPoly , \cmJazz to go back to the 
default behavior.

polychordsDemo.ly
Description: Binary data

Thanks for all the help I received to come to this solution!

Jean-Alexis