Replace UIBase.getglobalui() with getglobalui()

The latter is shorter and looks nicer. UIBase was a very weird class
name for something that is "user visible". We don't need to use (or
see) it from higher level code for most of the code now.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

offlineimap/threadutil.py

@@ -20,7 +20,7 @@ from threading import *
 from StringIO import StringIO
 from Queue import Queue, Empty
 import sys, traceback, thread, time
-from offlineimap.ui import UIBase       # for getglobalui()
+from offlineimap.ui import getglobalui
 
 profiledir = None
 
@@ -129,7 +129,7 @@ def exitnotifymonitorloop(callback):
 
 def threadexited(thread):
     """Called when a thread exits."""
-    ui = UIBase.getglobalui()
+    ui = getglobalui()
     if thread.getExitCause() == 'EXCEPTION':
         if isinstance(thread.getExitException(), SystemExit):
             # Bring a SystemExit into the main thread.
@@ -297,5 +297,3 @@ class MultiLock:
                 self.lock.release()
         finally:
             self.statuslock.release()
-
-