Various Fixes:
- Fix mistake in Sally Gardens B part bar 6
- Add support for single row 'C' accordion button tablature
- Add script to count the number of notes in each tune (bin/count-notes.sh)
- Final note on the first line of 0302_the-rakes-of-kildare was F, should be G
- Fix key (K) header for tunes not in a major key. K was previously set by reference to the key signature assuming everything was in a major key. This wasn't true, and this edit corrects the K fields for those tunes in related keys.
- Stop cheatsheet columns overlapping and change ordering. A change somewhere caused the columns in the cheetsheets to overlap. In fixing this it became obvious how to simplify cheetsheet processing and appearance by making the alphabetic flow go across the page first, rather than down.