IonSim.jl
                                
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                        Heterogeneous ions on lattice
this needs to happen after #25
joe requests this happens before 1.0
A possibly useful reference: (likely one of many): Appendix A of master's thesis "Machine Learning and Optimization Techniques for Trapped-ion Quantum Simulators" by Yi Hong Teoh, University of Waterloo https://uwspace.uwaterloo.ca/bitstream/handle/10012/17322/Teoh_Yi%20Hong.pdf?sequence=1