local status: deletemessagelist: remove broken code

This did not work and is not usefull since the purge() method was introduced in
1410a391bc. Actually, the purge() does what deletemessagelist() was supposed to
achieve.

Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

offlineimap/folder/LocalStatus.py

@@ -50,10 +50,6 @@ class LocalStatusFolder(BaseFolder):
     def getfullname(self):
         return self.filename
 
-    def deletemessagelist(self):
-        if not self.isnewfolder():
-            os.unlink(self.filename)
-
     # Interface from BaseFolder
     def msglist_item_initializer(self, uid):
         return {'uid': uid, 'flags': set(), 'labels': set(), 'time': 0, 'mtime': 0}

offlineimap/folder/LocalStatusSQLite.py

@@ -118,14 +118,6 @@ class LocalStatusSQLiteFolder(BaseFolder):
     def isnewfolder(self):
         return self._newfolder
 
-
-    # Interface from LocalStatusFolder
-    def deletemessagelist(self):
-        """Delete all messages in the db."""
-
-        self.__sql_write('DELETE FROM status')
-
-
     def __sql_write(self, sql, vars=None, executemany=False):
         """Execute some SQL, retrying if the db was locked.