cleanup import satements

- conform to PEP8
- explicitly define symbols instead of 'import *'
- remove unused import

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

offlineimap/ui/Curses.py

@@ -21,7 +21,7 @@ import time
 import sys
 import os
 import signal
-import curses, curses.panel, curses.textpad, curses.wrapper
+import curses
 from Blinkenlights import BlinkenBase
 from UIBase import UIBase
 import offlineimap