PEP8 style fixes and other small style fixes

I used autopep8 on some files and did carefully check the changes.
I ignored E501,E302,E231,E225,E222,E221,E241,E203 in my search, and at
least E501 on any autopep8 run.

Other style fixes not related to PEP8:
* Only use new-style classes. I don't think the usage of old-style
  classes was voluntary. Old-style classes are removed in Python 3.
* Convert an if/else to a one-liner in mediawiki, change docstring style
  change to a comment something that wasn't really appropriate for a
  docstring.
* Unneeded first if condition in meteofrance

modules/mediawiki/backend.py

@@ -29,6 +29,7 @@ from .browser import MediawikiBrowser
 
 __all__ = ['MediawikiBackend']
 
+
 class MediawikiBackend(BaseBackend, ICapContent):
     NAME = 'mediawiki'
     MAINTAINER = u'Clément Schreiner'
@@ -42,6 +43,7 @@ class MediawikiBackend(BaseBackend, ICapContent):
                            ValueBackendPassword('password', label='Password', default=''))
 
     BROWSER = MediawikiBrowser
+
     def create_default_browser(self):
         username = self.config['username'].get()
         if len(username) > 0: