M-librarian

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* Fix button "Save" at the bottom of the screen to be always visible.

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* Sort list of authors by clicking on column labels.

* Fix a bug with adding the same genre to a book.

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* wx.grid: Wrap long lines.

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* GUI with ``wxPython``.

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* GHActions: Test with Python 3.12.

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* GHActions: Ensure ``pip`` only if needed

This is to work around a problem in conda with Python 3.7 -
it brings in wrong version of ``setuptools`` incompatible with Python 3.7.