v9.0

• Re-work Dulcimer music again. The new plan is to have:

  • Melody tabs (for noter-drone play) for instruments with melody
    strings tuned to particular notes such as 'D' (from DAD) and
    perhaps other notes like 'A' (from DAA)
  • Chords (for chord play) for instruments tuned DAD and perhaps
    other tunings

This edit included DAD chords and 'A' and 'A' melody TABs.

• Reorganise files to put included .abc fragments and format files to sub-directories

• Move tab and chord definition/selection into separate .fmt files, one for each output format