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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#! /bin/sh -e

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case "$1" in

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    configure|abort-upgrade|abort-remove|abort-deconfigure)

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        update-rc.d cubicweb defaults 99 >/dev/null

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    ;;

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    *)

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        echo "postinst called with unknown argument \`$1'" >&2

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        exit 1

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    ;;

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esac

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#DEBHELPER#

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exit 0