PEP8: few more changes

Taken MR comments into account:
* `and` is considered a binary operator, thus put at the beginning of the line when splitting a line,
* same for `+`,
* same for `.` (different reasons).

gestioncof/autocomplete.py

@@ -39,8 +39,8 @@ def autocomplete(request):
                                                     flat='True')) \
         + list(queries['users'].values_list('profile__login_clipper',
                                             flat='True'))
-    queries['clippers'] = queries['clippers'].\
-        exclude(username__in=usernames).distinct()
+    queries['clippers'] = queries['clippers'] \
+        .exclude(username__in=usernames).distinct()
     # add clippers
 
     data.update(queries)