static Drul_array<vector<Grob *> > get_clash_groups (Grob *me);
DECLARE_SCHEME_CALLBACK (calc_positioning_done, (SCM smob));
static void add_column (Grob *me, Grob *ncol);
static Drul_array<vector<Grob *> > get_clash_groups (Grob *me);
DECLARE_SCHEME_CALLBACK (calc_positioning_done, (SCM smob));
static void add_column (Grob *me, Grob *ncol);