* Update linting configuration
This removes flake8 in favor of ruff, which also provides isort support, and
updates all files to be black, isort, and ruff compliant. This also adds black
and ruff checks to the tox and Github linting workflow.
* Tweak the code coverage config and calls
* Also accept lists and tuples as value of `depends_on`.
* The elements of the lists/tuples may be either Jobs or Job IDs.
* A single Job / Job ID is still accepted as well.
* Represent _all_ job dependencies in `Job.to_dict()`.
We now represent the entire list, instead of just the first element.
* Fix some doctext regarding plurality of dependencies.
* Add unit tests for job dependencies.
* One unit test establishes a pattern for checking execution order as affected by dependencies.
* Another unit test applies this pattern to the new capability to name multiple dependencies.
* Add unit test for new `depends_on` input formats.
Also test that these are properly persisted.
* Repair `Job.restore()`.
Need to convert bytes back to strings when reloading `dependency_ids`.
* Maintain backwards compat. in `Job.to_dict()`.
Keep the old `dependency_id` (singular) key.
* Provide coverage for new test fixture.
* Simplify some code.
Cut some superfluous `as_text()` calls left over from an earlier commit.
* Check for `dependency_id` in `Job.restore()` for backwd. compat.
Also eliminate use of `as_text()` here, in favor of `.decode()`.
* Switch to snake case instead of camel case.
* Eliminate some usages of `as_text()`.
Also cut some `print` statements.
* Cleanup.
* Accept arbitrary iterables for `Job`'s `depends_on` kwarg.
Instead of requiring a list or tuple, we now make use of `ensure_list()`.
* Add test fixtures.
* Provide a system to get two workers working simultaneously, using `multiprocessing`.
* Define a simple job that just says whether its dependencies are met.
* In `rpush`, make an option to record the name of the worker.
* Improve unit tests on execution order with dependencies.
These now actually have two workers going, which makes a more thorough test.
* Add unit test examining `Job.dependencies_are_met()` at execution time.
* Redesign dependency execution order unit tests.
* Simplify assertions.
* Improve doctext and formatting.
* Move fixture tests to new, dedicated module `test_fixtures.py`.
* Use `enqueue` instead of `enqueue_call` in new unit tests.
Rob Hudson
Hugo
skieffer