Import new forces and forcefactories in __init__.py
@@ -10,4 +10,4 @@ from openmmtools import version
__version__ = version.version
# Import modules.
-from openmmtools import testsystems, integrators, alchemy, mcmc, states, cache, utils, constants
+from openmmtools import testsystems, integrators, alchemy, mcmc, states, cache, utils, constants, forces, forcefactories
