Change license to Apache2 (still GPL-compatible but no need for a sma…

…ll utility to be GPL; Lilypond itself remains GPL)

require Lilypond 2.18+ (our bar-number overrides don't work on 2.16 a…

…nd the script is no longer being regularly tested against 2.16)

add style options: NoBarNums, SeparateTimesig

ensure jianpu grace notes are printed inside slurs (fixes ssb22#8 on …

…GitHub)

Update jianpu-ly.py

Update jianpu-ly.py

Support grace-notes and simple chords (closes ssb22#5 and ssb22#6 on …

…GitHub)

Remove git-sync.sh (updates now done by homepage/Makefile itself)

Update jianpu-ly.py

Update jianpu-ly.py