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There are no more eternal tasks. The LVAlert listener is run as
a bootstep, embedded in a worker.

According to
https://docs.celeryproject.org/en/stable/userguide/periodic-tasks.html?highlight=periodic#entries,
since we are adding periodic tasks in a callback in a task module,
we need to use the `on_after_finalize` signal, rather than
`on_after_configure`.

I also had to make some small changes to the app finalization that
I worked out by trial and error.

Fixes #363.

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The dev dependencies include flower (for monitoring) and ipython
(for interactive shells).

The flower console was not working because flower was not
installed on the cluster.

Editable installs to the user site packages directory do not work
for PEP 517 packages. See https://github.com/pypa/pip/issues/7953.

Modern versions of pip install to the user site-packages directory
if the system site-packages directory is not writable.

This is a temporary workaround for #357 until sccb/requests#741
has been fixed.

Pinning the conda environment makes the installation fully
reproducible and prevents breakage due to stealth updates to the
underlying system site-packages.

celery group are now ordered by default

This consolidates one more hidden file/directory, to keep the
project root directory a little bit cleaner.

This is needed to enable Kerberos login on the cluster.
The Caltech sysadmins added this to the home directory, but it was
not under version control.

The autodoc_mock_imports is very complex and brittle.