Ffsim

What's Changed
* add real-valued ucj operator by kevinsung in https://github.com/qiskit-community/ffsim/pull/77
* add functions and tests for random two-body tensors by kevinsung in https://github.com/qiskit-community/ffsim/pull/79
* add orbital rotation for molecular hamiltonian by kevinsung in https://github.com/qiskit-community/ffsim/pull/80


**Full Changelog**: https://github.com/qiskit-community/ffsim/compare/v0.0.15...v0.0.16

What's Changed
* add single-factorized hamiltonian by kevinsung in https://github.com/qiskit-community/ffsim/pull/76
* performance improvements from using standard library math functions instead of numpy functions


**Full Changelog**: https://github.com/qiskit-community/ffsim/compare/v0.0.14...v0.0.15

What's Changed
* use fast contract_2e from pyscf by kevinsung in https://github.com/qiskit-community/ffsim/pull/70
* implement linear operator protocol for df hamiltonian by kevinsung in https://github.com/qiskit-community/ffsim/pull/73


**Full Changelog**: https://github.com/qiskit-community/ffsim/compare/v0.0.13...v0.0.14

**Full Changelog**: https://github.com/qiskit-community/ffsim/compare/v0.0.12...v0.0.13

First release not marked as pre-release.

What's Changed
* create cistring module with cached substitutes for pyscf functions by kevinsung in https://github.com/qiskit-community/ffsim/pull/68


**Full Changelog**: https://github.com/qiskit-community/ffsim/compare/v0.0.10-alpha...v0.0.11-alpha