4 - | checks for bar in a voice (Barcheck_req)
6 - naming (Hungarian notation, svec vs. Array)
7 - huge memleak fixed; unearthed lots of bugs
9 - cleanup PScore, Score
10 - removed Staff_commands, plugging commands into Staff_column directly
17 - Move breaking stuff into a separate class Break_algorithm
18 - dependencies for Staff_elem's
21 - updated doco to .pod
22 - include files from .ly
24 - Rational for time measurement
25 - directionalspanner/textspanner
28 - grouping code: LilyPond can set advanced multibeams.
34 - robust Staff_commands
37 - robust Input_commands
38 - merged Vertical_/Horizontal music
39 - PARTIALs with duration
40 - modularized lexer: multiple runs
43 - notenames configurable
55 - Horizontal/Vertical music