Improving \harmonicBy... functions (issue 5695059)

[dak]

http://codereview.appspot.com/5695059/diff/1001/ly/music-functions-init.ly
File ly/music-functions-init.ly (right):

http://codereview.appspot.com/5695059/diff/1001/ly/music-functions-init.ly#newcode393
ly/music-functions-init.ly:393: (make-harmonic
As each #{...#} carries a bit of overhead, there is little point in
having two of them wrapped in make-sequential-music.  Just make a single
#{ ... #} instead of the whole make-sequential-music and splice
$(make-harmonic ...) in the middle.

http://codereview.appspot.com/5695059/