attempt to fix issue 215, which demonstrates that time-dependent expressions with multiple terms are not properly handled (missing parenthises)
attempt to fix issue 215, which demonstrates that time-dependent expressions with multiple terms are not properly handled (missing parenthises)

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