. * agressive type-checking for SCM stuff.
. * use "staff-space" and "half-space" iso interline,
staff_line_leading () etc.
+. * why does Voice.beamQuantisation = #'none not work?
+ overriding in ly/params.ly works fine
. * TODO^2:
. * make a TODO.texi, like http://www.gnu.org/software/guile/ideas.html