added wigner_fock_distribution and fock_distribution as default import in __init__
added wigner_fock_distribution and fock_distribution as default import in __init__

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