Uses Kip's CartesianIndicesShifted to efficiently implement periodic boundary conditions. Also accelerates energy_aux and allows the interactions to use site indices instead of cell+sublattice (if someone were to add an interaction in the future, this is the nicer way for them to write their code in the first place)
Uses Kip's CartesianIndicesShifted to efficiently implement periodic boundary conditions. Also accelerates
energy_auxand allows the interactions to use site indices instead of cell+sublattice (if someone were to add an interaction in the future, this is the nicer way for them to write their code in the first place)