[Diff since v0.3.7](https://github.com/JuliaMolSim/DFTK.jl/compare/v0.3.7...v0.3.8) **Closed issues:** - Implement conversions between grids (#43) - [WIP] Autodiff stresses (#443) - Bug Using Charged systems (#485) **Merged pull requests:** - Hellmann-Feynman stresses via ForwardDiff and custom rules (#476) (@niklasschmitz) - Avoid mutation in ρ_from_total_and_spin (#482) (@antoine-levitt) - Pwbasis refactor (#486) (@antoine-levitt) - Extend ForwardDiff fallback for SVector norm to handle multiple partials (#488) (@niklasschmitz) - Allow passing Ecut as a keyword argument (#489) (@mfherbst) - Simplify loading logic for ForwardDiff workarounds (#490) (@mfherbst)