Clean build after conversion to 2.18.2
Add VerticalAxisGroup.remove-first
Removed reference to letter size, reviewed layout in letter and a4
Update to 2.18.2
Remove letter-specific settings, review in both letter and a4 sizes
Update to LilyPond 2.18.2
Merge branch 'rootgf-427' of https://github.com/glenl/The-Mutopia-Project
Merge branch 'rootgf-428' of https://github.com/glenl/The-Mutopia-Project
Header tweaks