Easy spacing fixes, trailing stuff

Remove useless trailing \
Remove trailing spaces
Add missing empty lines

autopep8 -ir -j2 --select=E301,E302,E502,W291,W293,W391 .

Diff quickly checked.

weboob/tools/application/console.py

@@ -50,9 +50,11 @@ class BackendNotGiven(Exception):
         Exception.__init__(self, 'Please specify a backend to use for this argument (%s@backend_name). '
                 'Availables: %s.' % (id, ', '.join(name for name, backend in backends)))
 
+
 class BackendNotFound(Exception):
     pass
 
+
 class ConsoleApplication(BaseApplication):
     """
     Base application class for CLI applications.