Update MozartWA/KV487/no9 to 2.18
Update MozartWA/KV487/no10 to 2.18
Update MozartWA/KV487/no11 to 2.18
Update MozartWA/KV487/no12 to 2.18
MozartWA/KV487/no9-12: Whitespace
MozartWA/KV487/no9-12: header.ly -> header.ily
MozartWA/KV487/no9-12: copyright -> license
Merge branch 'KV487_9-12' of https://github.com/doughdemon/The-Mutopia-Project
Header tweaks