Move n_dofs to engine; add engine.has_constraints() #979
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This moves the calculation of the number of degrees of freedom to the engine. This is expected to be a constant for an engine -- at least, the engines we have so far don't allow number of particles to change -- so it makes sense to cache it (for OpenMM), instead of calculating it over and over with the
snapshot.n_degrees_of_freedomfeature.This also adds an
engine.has_constraints()method. This gives a cleaner way to abort if an engine with constraints tries to use one of theDirectionModifiersnapshot modifiers.