Discard new copyright-based footer when rebuilding footer
Initial version Clementi's Art of Playing Pianoforte (Javier Ruiz-Alma)
For LilyPond version 2.16
pdf makefile: clementi-op42.ly
midi makefile: clementi-op42-midi.ly
Merge branch 'clementi-op42' of https://github.com/dominicus/The-Mutopia-Project
Update header