Remove cross-bond terms for ring-making/breaking perturbations#517
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Remove cross-bond terms for ring-making/breaking perturbations#517
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This PR fixes the merge code for ring-break perturbations by cleaning up (removing) spurious bonded terms from the end-state where the bond is absent, i.e. angles, dihedrals, and impropers that cross the bond. The merge code is built on the assumption of the same connectivity at each state, so terms that are unique to one state are mirrored in the other, which isn't correct when a bond is broken.
develinto this branch before issuing this pull request (e.g. by runninggit pull origin devel): [y]