added qsave and qload functions that save and load stuff, respectively, from a given file.
added qsave and qload functions that save and load stuff, respectively, from a given file.

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