------------------
- Announce for now that croniter dev is ended (CRA).
- Rework timestamp_to_datetime to use whatever timezone [kiorky]
- Make datetime_to_timestamp & timestamp_to_datetime public [kiorky]
- Fix EPOCH calculation in case of non UTC & 32 bits based systems [kiorky]
- Apply isort formatter [kiorky]
- Reintegrate test_speed [kiorky]
- Apply black formatter [evanpurkhiser, kiorky]
- Code quality changes [evanpurkhiser, kiorky]
- Remove unused _get_caller_globals_and_locals [evanpurkhiser]
- Remove single-use bad_length [evanpurkhiser]
- Remove unused `days` in `proc_month` [evanpurkhiser]
- Use `field_index` over `i` for readability [evanpurkhiser]
- Always use `"""` for docstrings [evanpurkhiser]
- Make helper instance methods that do not use self static [evanpurkhiser]
- Remove unusd call to sys.exc_info [evanpurkhiser]
- Remove unused `ALPHAS` [evanpurkhiser]
- Improve `croniter.expand` documentation [evanpurkhiser]