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.

weboob/tools/application/qt/qt.py

@@ -26,8 +26,7 @@ from PyQt4.QtCore import QTimer, SIGNAL, QObject, QString, QSize, QVariant, QMut
 from PyQt4.QtGui import QMainWindow, QApplication, QStyledItemDelegate, \
                         QStyleOptionViewItemV4, QTextDocument, QStyle, \
                         QAbstractTextDocumentLayout, QPalette, QMessageBox, \
-                        QSpinBox, QLineEdit, QComboBox, QCheckBox, QInputDialog, \
-                        QLineEdit
+                        QSpinBox, QLineEdit, QComboBox, QCheckBox, QInputDialog
 
 from weboob.core.ouiboube import Weboob
 from weboob.core.scheduler import IScheduler