HadynFJ-O76: Replace copies of the source with symlinks
Update of HaydnFJ Op. 76
Haydn Op. 76 - Rename files

Change extension for included lys to .ily
Also fix a problem with the previous commit
Update of Donizetti's 18. string quartet
Add short README to Donizetti's 18. quartet
Add Blake's opus 2
Initial content for the Blake Opus 2 collection, including book sources
Initial content for CarcassiM op. 60
Added Edward Elgar
Initial content for Elgar's "There is Sweet Music", op. 53, no. 1
(Entered by Mojca Božič)
Remove completed project - Elgar's "There is Sweet Music"
Initial content
Initial content for Rolla's 6 duetti a due Viole
Submitted by Huw Richards
Add Joseph Küffner
Initial content
Initial content for op.60 no.13
Initial content for CarcassiM op60 no14
Initial content for CarcassiM Op60 No.16
Merge branch 'carcassi-o60-p5' of https://github.com/glenl/The-Mutopia-Project
Header tweaks