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/boursorama/pages/__init__.py

@@ -23,7 +23,8 @@ from .account_history import AccountHistory
 from .accounts_list import AccountsList
 from .login import LoginPage
 
-class AccountPrelevement(AccountsList): pass
+class AccountPrelevement(AccountsList):
+    pass
 
 __all__ = ['LoginPage',
            'AccountsList',