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/misc.py

@@ -68,6 +68,7 @@ try:
     html2text = h2t.html2text
 except ImportError:
     warning('python-html2text is not present. HTML pages will not be converted into text.')
+
     def html2text(html):
         return html
 
@@ -117,6 +118,7 @@ def utc2local(date):
     date = date.astimezone(tz.tzlocal())
     return date
 
+
 def limit(iterator, lim):
     count = 0
     iterator = iter(iterator)
@@ -125,6 +127,7 @@ def limit(iterator, lim):
         count += 1
     raise StopIteration()
 
+
 def ratelimit(group, delay):
     """
     Simple rate limiting.