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/parsers/htmlparser.py

@@ -23,7 +23,7 @@ import htmlentitydefs
 try:
     from xml.etree import cElementTree as ElementTree
 except ImportError:
-    from xml.etree import ElementTree
+    from xml.etree import ElementTree  # NOQA
 
 from .iparser import IParser
 
@@ -68,6 +68,7 @@ class HTMLTreeBuilder(_HTMLParser):
         except:
             pass
 
+
 class HTMLParser(IParser):
     def parse(self, data, encoding=None):
         parser = HTMLTreeBuilder(encoding)