Use newer form of catching exceptions

autopep8 -i --select=W602
Also some other minor deprecated syntax changes, like "while 1".
I did not commit the less obvious changes.

weboob/tools/decorators.py

@@ -41,7 +41,7 @@ def retry(ExceptionToCheck, tries=4, delay=3, backoff=2):
                     return f(*args, **kwargs)
                     try_one_last_time = False
                     break
-                except ExceptionToCheck, e:
+                except ExceptionToCheck as e:
                     logging.debug(u'%s, Retrying in %d seconds...' % (e, mdelay))
                     time.sleep(mdelay)
                     mtries -= 1