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/ing/pages/login.py

@@ -104,8 +104,9 @@ class LoginPage(BasePage):
         self.browser.submit(nologin=True)
 
     def error(self):
-        error = self.document.find('//span[@class="error"]')
-        return error is not None
+        err = self.document.find('//span[@class="error"]')
+        return err is not None
+
 
 class LoginPage2(BasePage):
     def on_loaded(self):