0.33.0

Release with minor improvements, but also some breaking of backwards compatibility. In particular, we made the definition of cell coordinates more precise, which previously was used inconsistently. Two different versions of cell coordinates have been used where integral coordinates either refer to the cell center or its left edge. We now define cell coordinates to use the latter, since then the integral part denotes the cell, while the fractional part denotes the position within the cell.

What's Changed

• Allow appending fields to field collection by @david-zwicker in #451
• Return shallow copy of fields in collection for safety by @david-zwicker in #452
• Allow disabling fancy progress bar by @david-zwicker in #453
• Remove outdated lgtm comments by @david-zwicker in #454
• Added support for solving Poisson's equation to cylindrical grids by @david-zwicker in #456
• Added support from complex fields in spectral operators by @david-zwicker in #457
• Allow dictionaries to initialize FieldCollection by @david-zwicker in #458
• Changed some comments and messages by @david-zwicker in #463
• Added mixed (Robin) boundary conditions with expressions by @david-zwicker in #464
• Improved some types and docstrings by @david-zwicker in #466
• Made definition of cell coordinates more precise by @david-zwicker in #467

Full Changelog: 0.32.2...0.33.0