v0.22.6

What's Changed

• Cleaned up get_boundary_conditions by @david-zwicker in #319
• Improved error message by @david-zwicker in #320
• Improved typing and documentation by @david-zwicker in #322
• Improve writing to storage in multiprocessing environment by @david-zwicker in #325
• Added possibility to evaluate derivative of smoothed data by @david-zwicker in #326
• Fixed conservative tensor divergence in spherical coordinates by @david-zwicker in #327
• Added mpi4py in requirements by @david-zwicker in #328
• Improved typing by @david-zwicker in #329

Full Changelog: v0.22.5...v0.22.6