added doc strings for new attributes in Odeoptions
added doc strings for new attributes in Odeoptions

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