Update of Handel "Sonatina in B-flat major"

close #115
Update of Rameau "Les Tendres Plaintes"

close #118
Update Grieg "Ases Tod - La Mort D'ase"

close #114
Merge branch 'missing-versions' of https://github.com/doughdemon/The-Mutopia-Project
Update footer
Update footer and source
Header tweaks