allow reversing the circuit represenation. added support for multigate symbol
allow reversing the circuit represenation. added support for multigate symbol

zasdfgbnm/qutip,anubhavvardhan/qutip,qutip/qutip,qutip/qutip,anubhavvardhan/qutip,cgranade/qutip,cgranade/qutip,zasdfgbnm/qutip