Fix failing nph unit tests
Fix failing nph unit tests

One array handle was not being freed before use elsewhere.

Moved setBox call to end of step so that all particles are in the box when setBox is called.
joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue