Unix-at

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Bugfixes:
* Avoid collision with new `match` keyword
* Read queue name if present in `at -l` output, only get queue "a"

Other:
* Switch project host from GitLab to GitHub

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Bugfixes:
* Support Python 3.10, where collections.Iterable is no longer available

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Bugfixes:
* Raise exceptions on problems, avoid returning None

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Enhancements:
* Add comparison operators to Job

Bugfixes:
* Call `atrm` rather than `at -r`, which seems more compatible

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Enhancements:
* Have `submit_python_job()` accept `python=None`
* Include stderr in AtError
* Add `__repr__` to Job

Bugfixes:
* Fix `at` argument not passing through `cancel_job()`

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Bugfixes:
* Fixes bytes issues on Python 3
* Fixes calling `submit_shell_job()` with a single command instead of iterable