Don't use sort() on dict values()

This won't work in python3 anymore, so just use sorted() when needed.
In one case, we could remove the sort() completely as were were sanity checking
one line above, that we only having one UID as response which makes sorting
unneeded.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

offlineimap/folder/IMAP.py

@@ -1,5 +1,5 @@
 # IMAP folder support
-# Copyright (C) 2002-2011 John Goerzen & contributors
+# Copyright (C) 2002-2012 John Goerzen & contributors
 #
 #    This program is free software; you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by
@@ -327,7 +327,6 @@ class IMAPFolder(BaseFolder):
             raise ValueError("While attempting to find UID for message with "
                              "header %s, got wrong-sized matchinguids of %s" %\
                                  (headername, str(matchinguids)))
-        matchinguids.sort()
         return long(matchinguids[0])
 
     def savemessage_fetchheaders(self, imapobj, headername, headervalue):