String representation of a Folder is its name

This enables us to just use the folder instance in the ui output and get
a name rather than having to call getname() all the time.

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

offlineimap/folder/Base.py

@@ -31,6 +31,9 @@ class BaseFolder:
         """Returns name"""
         return self.name
 
+    def __str__(self):
+        return self.name
+
     def suggeststhreads(self):
         """Returns true if this folder suggests using threads for actions;
         false otherwise.  Probably only IMAP will return true."""