[FIX] P3: CSV reading & writing

addons/base_import/models/base_import.py

addons/base_import/tests/test_base_import.py

addons/l10n_fr_fec/wizard/account_fr_fec.py

addons/l10n_lu/scripts/tax2csv.py

addons/web/controllers/main.py

doc/python3.rst

odoo/addons/test_pylint/tests/test_pylint.py

odoo/cli/server.py

odoo/tools/convert.py

odoo/tools/misc.py

odoo/tools/pycompat.py

odoo/tools/translate.py