M-librarian

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* GHActions: Install everything from ``conda``.
All required Python and PyPy versions are now available from ``conda-forge``.

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* Toggle checkboxes for books in series, for an author or all.

* Python 3.11.

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* Store lock file in a shared directory; use ``$UID`` as a suffix
to separate lock files for different users.

* Enhancement in web-ui: added a link to the root.

* GitHub Actions.

* Stop testing at Travis CI.

* Stop testing at AppVeyor.

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* Python 3.7.

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* Search by book's title.

* Use filters from config.

* Configure columns for author and book tables.

* Config file, all sections and all key are now completely optional.

* Environment variables are expanded in paths in config file.

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* Allow to select many books at once.

* Allow to download many books at once.