Fix broken flake8 configuration and flake8 errors which were hidden by this breakage. flake8 --filename options doesn't work as expected: * it's expected to be a shell pattern, using stdlib's fnmatch.fnmatch function internally. This funciton thinks that 'cubicweb/x.py' doesn't match 'cubicweb/x.py' (there must be a reason but that's not the point), hence no file was actually checked ; * as this is a list of pattern, each encountered file is checked against each pattern, leading to run time explosion. So maintain list of files to check in a separated file and give this list to flake8 using unix's xarg command.

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^build$

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^dist$

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\.egg-info$

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^.tox$

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^.cache$

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\.pyc$

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\.pyo$

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\.bak$

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\.old$

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\~$

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\#.*?\#$

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\.swp$

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^doc/book/en/apidoc$

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\.old$

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syntax: regexp

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.*/data.*/database/.*

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.*/data/ldapdb/.*

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.*/data/uicache/

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.*/data/libpython/cubicweb_.*/i18n/.*\.po

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^doc/html/

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^doc/doctrees/

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^doc/book/en/devweb/js_api/

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^doc/_build

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^doc/js_api/

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test-results.xml