Do not make object inheritance

This patch removes these lintian warnings:

Warning R0205: Class 'X' inherits from object,
can be safely removed from bases in python3 (useless-object-inheritance)

offlineimap/CustomConfig.py

@@ -157,7 +157,7 @@ def CustomConfigDefault():
     pass
 
 
-class ConfigHelperMixin(object):
+class ConfigHelperMixin():
     """Allow comfortable retrieving of config values pertaining
     to a section.
 

offlineimap/folder/Base.py

@@ -26,7 +26,7 @@ from offlineimap.error import OfflineImapError
 import offlineimap.accounts
 
 
-class BaseFolder(object):
+class BaseFolder():
     __hash__ = None
 
     def __init__(self, name, repository):

offlineimap/folder/LocalStatusSQLite.py

@@ -25,7 +25,7 @@ import six
 from .Base import BaseFolder
 
 
-class DatabaseFileLock(object):
+class DatabaseFileLock():
     """Lock at database file level."""
 
     def __init__(self):

offlineimap/imaplibutil.py

@@ -32,7 +32,7 @@ from offlineimap.ui import getglobalui
 from offlineimap.virtual_imaplib2 import IMAP4, IMAP4_SSL, InternalDate
 
 
-class UsefulIMAPMixIn(object):
+class UsefulIMAPMixIn():
     def __getselectedfolder(self):
         if self.state == 'SELECTED':
             return self.mailbox

offlineimap/imapserver.py

@@ -42,7 +42,7 @@ except ImportError:
     have_gss = False
 
 
-class IMAPServer(object):
+class IMAPServer():
     """Initializes all variables from an IMAPRepository() instance
 
     Various functions, such as acquireconnection() return an IMAP4
@@ -770,7 +770,7 @@ class IMAPServer(object):
         self.semaphore.release()
 
 
-class IdleThread(object):
+class IdleThread():
     def __init__(self, parent, folder=None):
         """If invoked without 'folder', perform a NOOP and wait for
         self.stop() to be called. If invoked with folder, switch to IDLE

offlineimap/init.py

@@ -62,7 +62,7 @@ def syncitall(list_accounts, config):
     threads.wait()  # Blocks until all accounts are processed.
 
 
-class OfflineImap(object):
+class OfflineImap():
     """The main class that encapsulates the high level use of OfflineImap.
 
     To invoke OfflineImap you would call it with::

offlineimap/localeval.py

@@ -19,7 +19,7 @@
 import imp
 
 
-class LocalEval(object):
+class LocalEval():
     """Here is a powerfull but very dangerous option, of course."""
 
     def __init__(self, path=None):

offlineimap/mbnames.py

@@ -78,7 +78,7 @@ def writeIntermediateFile(accountname):
         _mbnames.write()
 
 
-class _IntermediateMbnames(object):
+class _IntermediateMbnames():
     """mbnames data for one account."""
 
     def __init__(self, accountname, folder_root, mbnamesdir, folderfilter,
@@ -120,7 +120,7 @@ class _IntermediateMbnames(object):
                 json.dump(itemlist, intermediateFD)
 
 
-class _Mbnames(object):
+class _Mbnames():
     def __init__(self, config, ui, dry_run):
 
         self._config = config

offlineimap/repository/IMAP.py

@@ -510,7 +510,7 @@ class IMAPRepository(BaseRepository):
                 """Converts a cmp= function into a key= function
                 We need to keep cmp functions for backward compatibility"""
 
-                class K(object):
+                class K():
                     def __init__(self, obj, *args):
                         self.obj = obj
 

offlineimap/repository/__init__.py

@@ -30,7 +30,7 @@ from offlineimap.repository.LocalStatus import LocalStatusRepository
 from offlineimap.error import OfflineImapError
 
 
-class Repository(object):
+class Repository():
     """Abstract class that returns the correct Repository type
     instance based on 'account' and 'reqtype', e.g.  a
     class:`ImapRepository` instance."""

offlineimap/threadutil.py

@@ -37,7 +37,7 @@ def semaphorereset(semaphore, originalstate):
         semaphore.release()
 
 
-class accountThreads(object):
+class accountThreads():
     """Store the list of all threads in the software so it can be used to find out
     what's running and what's not."""
 

offlineimap/ui/UIBase.py

@@ -50,7 +50,7 @@ def getglobalui():
     return globalui
 
 
-class UIBase(object):
+class UIBase():
     def __init__(self, config, loglevel=logging.INFO):
         self.config = config
         # Is this a 'dryrun'?

offlineimap/utils/const.py

@@ -6,7 +6,7 @@
 import copy
 
 
-class ConstProxy(object):
+class ConstProxy():
     """Implements read-only access to a given object
     that can be attached to each instance only once."""