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Implement energy scan for local angle/torsion stiffness #136

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@cwalker7

Similar to the energy reevaluation/reweighting code for scanning different sequences of nonbonded parameters, add a function for scanning local angle or torsion parameters.

Suppose we have a reference simulation with all A monomers, and we want to scan sequences of AB copolymers, where B has the same nonbonded parameters as A, but bonded parameters such as k_angle ABA and k_angle BAB are different. This framework should precompute the nonbonded energies, and then compute the modified bonded terms using basis functions (basically the reverse problem as the nonbonded scan).

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