new unit test module for utilities, with test case for unit conversions
new unit test module for utilities, with test case for unit conversions

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