New Features
- Add `LatticeLNLS` reference workflow for larger-than-QPU lattice-structured problems.
- Add `LatticeLNLSSampler`, a dimod-compatible hybrid decomposition sampler for problems of lattice structure.
- Add `make_origin_embeddings` decomposer that creates optimal embeddings for a QPU or cubic lattice.
Fixes
- Support unorderable variables in energy based decomposer (fixes 273).