Added Honeycomb_XC and Honeycomb_YC lattices in lattices.jl. #144
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ITensors can be used to simulate quasi-2D systems using a cylindrical geometry. Before this PR ITensorMPS had functionalities for square and triangular lattices. I have added Honeycomb_XC (if the open edge of the cylinder has zigzag edges) and Honeycomb_YC (if the open edge has an armchair boundary). This can be useful for someone simulating the Kitaev-Heisenberg or other interesting models using MPS techniques.
Right now, the tests for the Honeycomb lattices are similar to the ones for square and triangular lattices. It checks if the length of the Lattice array is equal to the number of bonds.