They bring nothing of value (we never use import * anyway) and introduce
a maintenance burden.
The __all__ that I left might not be very useful either but at least
they are not a pain to maintain; they are also used by pyflakes in some
cases.
With flake8, we can check for more issues and ignore those who are not
real issues.
This allowed me to find genuine errors in:
- modules/boursorama/pages/account_history.py
- modules/ing/pages/login.py
- weboob/tools/application/qt/qt.py
I left one in weboob/tools/browser/browser.py for the time being.
Some PEP8 fixes on other files.