Get rid of pygtk.require. It doesn't make a lot of sense

and recent apps are not using it anyway.

sugar/chat/Chat.py

@@ -6,9 +6,9 @@ import dbus
 import dbus.service
 import dbus.glib
 
-import pygtk
-pygtk.require('2.0')
-import gtk, gobject, pango
+import gtk
+import gobject
+import pango
 
 from sugar.chat.Emoticons import Emoticons
 from sugar.chat.ChatToolbar import ChatToolbar

sugar/chat/ChatEditor.py

@@ -1,5 +1,3 @@
-import pygtk
-pygtk.require('2.0')
 import gtk
 from gettext import gettext as _
 

sugar/chat/ChatToolbar.py

@@ -1,5 +1,3 @@
-import pygtk
-pygtk.require('2.0')
 import gtk
 
 from sugar.chat.Emoticons import Emoticons

sugar/chat/richtext.py

@@ -1,8 +1,4 @@
-#!/usr/bin/env python
-
-import pygtk
 import gobject
-pygtk.require('2.0')
 import gtk
 import pango
 import xml.sax

sugar/chat/sketchpad/SketchPad.py

@@ -1,5 +1,3 @@
-import pygtk
-pygtk.require('2.0')
 import gtk
 
 from Sketch import Sketch

sugar/chat/sketchpad/Toolbox.py

@@ -1,5 +1,3 @@
-import pygtk
-pygtk.require('2.0')
 import gtk
 import gobject
 

sugar/p2p/MostlyReliablePipe.py

@@ -10,9 +10,8 @@ import StringIO
 import binascii
 import random
 
-import pygtk
-pygtk.require('2.0')
-import gtk, gobject
+import gtk
+import gobject
 
 
 def _stringify_sha(sha_hash):

sugar/presence/Buddy.py

@@ -1,9 +1,8 @@
 import base64
 import logging
 
-import pygtk
-pygtk.require('2.0')
-import gtk, gobject
+import gtk
+import gobject
 
 from sugar.p2p import Stream
 from sugar.p2p import network

sugar/presence/PresenceService.py

@@ -627,7 +627,7 @@ def runTests():
 	runner.run(suite)
 
 def main():
-	import pygtk, gtk
+	import gtk
 	global ps
 	ps = PresenceService.get_instance()
 	ps.start()