Method symmetry

src/vec.cpp:1157–1165

symmetry identity() { return symmetry(); }

symmetry::symmetry() {
  g = 1;
  ph = 1.0;
  FOR_DIRECTIONS(d) {
    S[d].d = d;
    S[d].flipped = false;
  }
  next = NULL;
}

symmetry::symmetry(const symmetry &s) {
  g = s.g;