HTML input: formats.html.import_set #245
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formats.html.import_set imports a Dataset from an HTML table.
It assumes there is exactly one table in the HTML document. (An import_book function would be more appropriate to handle multiple tables, but that doesn't seem very useful.) Headers are taken from elements if they exist.
BeautifulSoup (bs4) is used for HTML parsing, assuming it's OK to add that dependency. I didn't add a copy of bs4 to the "packages" directory since I'm not sure if that is necessary, or why it was done with other dependencies. Alternately, it could be added as a requirement in setup.py. Which way would be best?