misc ui and lib fixes for py3

lib/base_wizard.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+# -*- coding: utf-8 -*-
 #
 # Electrum - lightweight Bitcoin client
 # Copyright (C) 2016 Thomas Voegtlin
@@ -22,12 +22,7 @@
 # ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-from __future__ import unicode_literals
 
-import six
 import os
 from . import bitcoin
 from . import keystore
@@ -36,6 +31,7 @@ from .wallet import Wallet, Imported_Wallet, Standard_Wallet, Multisig_Wallet, w
 from .i18n import _
 from .plugins import run_hook
 
+
 class BaseWizard(object):
 
     def __init__(self, config, storage):