Initial Python 3 compatible code

src/extra/SpellChecker/__init__.py

@@ -1,4 +1,5 @@
 from __future__ import absolute_import
+from __future__ import unicode_literals
 from . import spellchecker
 import platform
 if platform.system() == "Windows":

src/extra/SpellChecker/spellchecker.py

@@ -1,5 +1,8 @@
 # -*- coding: utf-8 -*-
 from __future__ import absolute_import
+from __future__ import unicode_literals
+from builtins import next
+from builtins import object
 import os
 import logging
 from . import wx_ui

src/extra/SpellChecker/twitterFilter.py

@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+from __future__ import unicode_literals
 import re
 from enchant.tokenize import Filter
 

src/extra/SpellChecker/wx_ui.py

@@ -16,6 +16,7 @@
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 ############################################################
+from __future__ import unicode_literals
 import wx
 import application