.. note::

   $ find sphinx tests LICENSE doc/conf.py -type f -exec sed -i '' -e 's/2007\-20../2007-2021/' {} \;
   $ git co sphinx/locale/**/*.js sphinx/templates/epub3/mimetype

Since 1bf7fe424, ``-D gettext_compact=0`` is not treated as disabling
the feature.  It is recognized as creating ``0.pot`` because its type is
Any.  This changes it to `[bool, str]`.

Keep imports alphabetically sorted and their order homogeneous across
Python source files.

The isort project has more feature and is more active than the
flake8-import-order plugin.

Most issues caught were simply import ordering from the same module.
Where imports were purposefully placed out of order, tag with
isort:skip.

The gettext_compact can now be a string which is then a single domain
for all documents.

Fixes #784