vector<Grob *> new_elts;
new_elts.insert (new_elts.end (), elts.begin (), elts.end ());
SCM neighbors_scm = me->get_object ("neighbors");
vector<Grob *> new_elts;
new_elts.insert (new_elts.end (), elts.begin (), elts.end ());
SCM neighbors_scm = me->get_object ("neighbors");