TTYUI: Fix python 2.6 compatibility

We were using super() on a class derived from logging.Formatter() which
worked fine in python 2.7. Apparently python 2.6 uses old-style classes
for this, so the TTYUI broke and crashed OfflineImap. This was
introduced in OLI 6.5.0, I think.

Fix it by calling logging.Formatter.... directly, rather than the
elegant super() (which I happen to like a lot more than is appropriate
in the python world).

Reported by Nik Reiman as github issue 23, should fix that issue.

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

Changelog.draft.rst

@@ -18,3 +18,5 @@ Changes
 
 Bug Fixes
 ---------
+
+* Fix python2.6 compatibility with the TTYUI backend (crash)

offlineimap/ui/TTY.py

@@ -24,12 +24,14 @@ from offlineimap.ui.UIBase import UIBase
 class TTYFormatter(logging.Formatter):
     """Specific Formatter that adds thread information to the log output"""
     def __init__(self, *args, **kwargs):
-        super(TTYFormatter, self).__init__(*args, **kwargs)
+        #super() doesn't work in py2.6 as 'logging' uses old-style class
+        logging.Formatter.__init__(self, *args, **kwargs)
         self._last_log_thread = None
 
     def format(self, record):
         """Override format to add thread information"""
-        log_str = super(TTYFormatter, self).format(record)
+        #super() doesn't work in py2.6 as 'logging' uses old-style class
+        log_str = logging.Formatter.format(self, record)
         # If msg comes from a different thread than our last, prepend
         # thread info.  Most look like 'Account sync foo' or 'Folder
         # sync foo'.