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

weboob/tools/application/formatters/webkit/webkitgtk.py

@@ -36,9 +36,9 @@ class WebBrowser(gtk.Window):
         self.connect('destroy', gtk.main_quit)
         self.set_default_size(800, 600)
         self.web_view = webkit.WebView()
-        sw = gtk.ScrolledWindow() 
-        sw.add(self.web_view) 
-        self.add(sw) 
+        sw = gtk.ScrolledWindow()
+        sw.add(self.web_view)
+        self.add(sw)
         self.show_all()