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different platforms and OpenMM versions, while Checkpoint files can not
be exchanged between platforms or versions of Openmm.

Added documentation of residue template generator with admonition that feature is experimental and API is subject to change.

and progress. Also added a small note about the determinism of
simulations on different platforms.

This should be *lower* than that of Unit (and ScaledUnit/BaseUnit), since we
still want Units to take priority over Quantities (but Quantity to take
precedence over regular ndarrays) for reasons like this:

>>> a = np.array([1]) * u.angstroms
>>> b = a * u.angstroms # should be np.array([1])*u.angstroms**2
>>> np.arange(10) * a # utilize broadcasting
[1 2 3 4 5 6 7 8 9 10] A**2

principle -> principal... I'm a bozo.