void set_to_ideal_line_configuration (vsize start, vsize end);
vsize current_configuration_count () const;
Line_division current_configuration (vsize configuration_index) const;
Page_spacing_result space_systems_on_n_pages (vsize configuration_index,
void set_to_ideal_line_configuration (vsize start, vsize end);
vsize current_configuration_count () const;
Line_division current_configuration (vsize configuration_index) const;
Page_spacing_result space_systems_on_n_pages (vsize configuration_index,