Use flake8 if available instead of pyflakes

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.

modules/boursorama/pages/account_history.py

@@ -23,7 +23,6 @@ from datetime import date
 import re
 
 from weboob.tools.browser import BasePage
-from weboob.capabilities.bank import Transaction
 from weboob.tools.capabilities.bank.transactions import FrenchTransaction