SimTk/openmm — pull request #415 by jchodera (2014-04-22 00:44:08+00:00)
Title: Added usesPeriodicBoxVectors() methods to Force and System

I've added `usesPeriodicBoxVectors()` methods to both `Force` and `System`. This method returns `true` if the force (or any force in the system) uses the periodic box vectors in the energy calculation.