Prune trailing whitespaces from code and documentation

They are redundant in all pruned cases and sometimes even create some
problems, e.g., when one tries to jump through paragraphs in vi.

Signed-off-by: Eygene Ryabinkin <rea@codelabs.ru>

offlineimap/folder/LocalStatusSQLite.py

@@ -35,7 +35,7 @@ class LocalStatusSQLiteFolder(LocalStatusFolder):
     #though. According to sqlite docs, you need to commit() before
     #the connection is closed or your changes will be lost!"""
     #get db connection which autocommits
-    #connection = sqlite.connect(self.filename, isolation_level=None)        
+    #connection = sqlite.connect(self.filename, isolation_level=None)
     #cursor = connection.cursor()
     #return connection, cursor
 
@@ -43,7 +43,7 @@ class LocalStatusSQLiteFolder(LocalStatusFolder):
     cur_version = 1
 
     def __init__(self, name, repository):
-        super(LocalStatusSQLiteFolder, self).__init__(name, repository)       
+        super(LocalStatusSQLiteFolder, self).__init__(name, repository)
         # dblock protects against concurrent writes in same connection
         self._dblock = Lock()
         #Try to establish connection, no need for threadsafety in __init__