Tuplet brackets: make bracket span all note heads
According to standard typesetting practice, tuplet brackets align
with the left-hand side of the first note and span to the right-
hand side of the last note head. This commit implements the
option span-all-note-heads
for realizing this.
Closes #6360 (closed) Closes #827 (closed)
Edited by Martín Rincón Botero