Add tox.

[JulienPalard]

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[JulienPalard]

With the "better" detection of tables I had to remove a test that was passing by chance: the test was ensuring we were finding errors in a table... and the table used in the test was so small it went undetected by the old check, so we were looking for errors in it. With the current detection of table we correctly identify the table as a table and stop searching in it.