M-librarian

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* Python 3: support for Py2 and Py3 (3.4+) with one codebase.

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* Add option -C|--config file.

* Change options: -D|--database, -P|--path, -F|--format.

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* Download many books.

* Pass format of the downloaded file name in the command line.

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* Download exactly one book.

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* Multidatabase - every script can open a database by pathname or DB URI.

* Print count after the list.

* Rename -d/--details options to -v/--verbose.

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* Search authors/extensions/genres/languages by database id.