added __repr__ function and smarter __str__ 
added __repr__ function and smarter __str__ 

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