made Qobj unit tests more robust by avoiding exact comparison of floats (which previously occationally failed)
made Qobj unit tests more robust by avoiding exact comparison of floats (which previously occationally failed)

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