Easy spacing fixes, trailing stuff

Remove useless trailing \
Remove trailing spaces
Add missing empty lines

autopep8 -ir -j2 --select=E301,E302,E502,W291,W293,W391 .

Diff quickly checked.

modules/pastebin/test.py

@@ -21,6 +21,7 @@ from weboob.tools.test import BackendTest
 from weboob.capabilities.base import NotLoaded
 from weboob.capabilities.paste import PasteNotFound
 
+
 class PastebinTest(BackendTest):
     BACKEND = 'pastebin'