Fix default Maildir File permissions.

open() and os.open() lead to different file permissions by default, and
while we have not changed the os.open that had been used, some code
changes led to these permissions slipping through. Fix this by setting
the permissions explicitly to 0666 (minus the users umask).

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

offlineimap/folder/Maildir.py

@@ -238,7 +238,7 @@ class MaildirFolder(BaseFolder):
         # open file and write it out
         try:
             fd = os.open(os.path.join(tmpdir, messagename),
-                           os.O_EXCL|os.O_CREAT|os.O_WRONLY)
+                           os.O_EXCL|os.O_CREAT|os.O_WRONLY, 0666)
         except OSError, e:
             if e.errno == 17: 
                 #FILE EXISTS ALREADY