Fix raise with 2to3

M    idlelib/configHandler.py
M    idlelib/tabpage.py
M    idlelib/EditorWindow.py
M    idlelib/rpc.py
M    idlelib/IOBinding.py
M    idlelib/RemoteDebugger.py
M    idlelib/TreeWidget.py
diff --git a/Lib/idlelib/IOBinding.py b/Lib/idlelib/IOBinding.py
index 1be1a21..dd51062 100644
--- a/Lib/idlelib/IOBinding.py
+++ b/Lib/idlelib/IOBinding.py
@@ -132,7 +132,7 @@
         codecs.lookup(name)
     except LookupError:
         # The standard encoding error does not indicate the encoding
-        raise LookupError, "Unknown encoding "+name
+        raise LookupError("Unknown encoding "+name)
     return name