unify rhs and rhs_func in sse and sme
unify rhs and rhs_func in sse and sme

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