added back parfor for ex_17, will now just run by hand to create figures
added back parfor for ex_17, will now just run by hand to create figures

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