added documentaiton, added isherm from Qobj module, and added ischeck function for Qobj.type attribute
added documentaiton, added isherm from Qobj module, and added ischeck function for Qobj.type attribute

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