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/ehentai/test.py

@@ -20,6 +20,7 @@
 
 from weboob.tools.test import BackendTest
 
+
 class EHentaiTest(BackendTest):
     BACKEND = 'ehentai'
 
@@ -35,4 +36,3 @@ class EHentaiTest(BackendTest):
         self.backend.fillobj(img, ('url',))
         self.assertTrue(v.url and v.url.startswith('http://'), 'URL for first image in gallery "%s" not found: %s' % (v.id, img.url))
         self.backend.browser.openurl(img.url)
-