[Diff since v0.3.9](https://github.com/JuliaMolSim/DFTK.jl/compare/v0.3.9...v0.3.10) **Merged pull requests:** - Stresses API (#487) (@antoine-levitt) - Improve _apply_plan type stability (#494) (@niklasschmitz) - Small updates to the documentation (#497) (@mfherbst) - Simplify defining custom elements (#498) (@mfherbst) - Add some missing fallbacks for interval arithmetic (#499) (@mfherbst) - Separate fft normalizations from plans (#500) (@antoine-levitt) - Add Juliacon workshop to DFT materials in the documentation. (#502) (@mfherbst) - Adapt potential mixing heuristics for very large model errors (#505) (@mfherbst)