static void get_bounds (Grob *, Grob **, Grob **);
static void add_column (Grob *me, Item *);
static void add_beam (Grob *me, Grob *);
static void get_bounds (Grob *, Grob **, Grob **);
static void add_column (Grob *me, Item *);
static void add_beam (Grob *me, Grob *);