added number of cpus and parallel options for Odeoptions class
added number of cpus and parallel options for Odeoptions class

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