Fix python2->3 conversion of pickle

extras/fix-oversize-files.py

@@ -2,7 +2,7 @@
 
 import os
 import sys
-import pickle as pickle
+import pickle
 import argparse
 import fcntl
 import re

nilmdb/fsck/fsck.py

@@ -23,7 +23,7 @@ import progressbar
 import re
 import time
 import shutil
-import pickle as pickle
+import pickle
 import numpy
 
 class FsckError(Exception):

nilmdb/server/bulkdata.py

@@ -9,7 +9,7 @@ from nilmdb.utils.time import timestamp_to_string as timestamp_to_string
 import nilmdb.utils
 
 import os
-import pickle as pickle
+import pickle
 import re
 import sys
 import tempfile