Folder.Maildir: No need to store 'uid' in messagelist dict.

The Message UID is already the key to self.messagelist, so we have that
information. It is redundant to save the UID again as
self.messagelist[uid]{'uid': uid} and we never made use of the
information anyway.

The same thing should be done with the other 2 backends.

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

offlineimap/folder/Maildir.py

@@ -165,10 +165,8 @@ class MaildirFolder(BaseFolder):
                 flags = set(flagmatch.group(1))
             else:
                 flags = set()
-            # 'filename' is 'dirannex/filename', e.g. cur/123_U=1_FMD5=1:2,S
-            retval[uid] = {'uid': uid,
-                           'flags': flags,
-                           'filename': file}
+            # 'filename' is 'dirannex/filename', e.g. cur/123,U=1,FMD5=1:2,S
+            retval[uid] = {'flags': flags, 'filename': file}
         return retval
 
     def quickchanged(self, statusfolder):
@@ -255,7 +253,7 @@ class MaildirFolder(BaseFolder):
         if rtime != None:
             os.utime(os.path.join(tmpdir, messagename), (rtime, rtime))
 
-        self.messagelist[uid] = {'uid': uid, 'flags': set(),
+        self.messagelist[uid] = {'flags': set(),
                                  'filename': os.path.join('tmp', messagename)}
         # savemessageflags moves msg to 'cur' or 'new' as appropriate
         self.savemessageflags(uid, flags)