rename "functools" to "local_functools".

It can't have the same name as the module it's trying to emulate.  Python's
local-imports-first rule means it would shadow the stdlib functools module and
we would always get the fallback version.

fs/base.py

@@ -31,7 +31,7 @@ except ImportError:
 
 from fs.path import *
 from fs.errors import *
-from fs.functools import wraps
+from fs.local_functools import wraps
 
 
 class DummyLock(object):

fs/errors.py

@@ -31,7 +31,7 @@ import sys
 import errno
 
 from fs.path import *
-from fs.functools import wraps
+from fs.local_functools import wraps
 
 
 class FSError(Exception):

fs/expose/dokan/__init__.py

@@ -68,7 +68,7 @@ kernel32 = ctypes.windll.kernel32
 from fs.base import threading
 from fs.errors import *
 from fs.path import *
-from fs.functools import wraps
+from fs.local_functools import wraps
 
 try:
     import libdokan

fs/expose/fuse/__init__.py

@@ -61,7 +61,7 @@ import pickle
 from fs.base import flags_to_mode, threading
 from fs.errors import *
 from fs.path import *
-from fs.functools import wraps
+from fs.local_functools import wraps
 
 try:
     import fuse_ctypes as fuse

fs/expose/sftp.py

@@ -36,7 +36,7 @@ import paramiko
 from fs.base import flags_to_mode
 from fs.path import *
 from fs.errors import *
-from fs.functools import wraps
+from fs.local_functools import wraps
 
 
 # Default host key used by BaseSFTPServer

fs/ftpfs.py

@@ -27,7 +27,7 @@ from time import sleep
 import datetime
 import re
 from socket import error as socket_error
-from fs.functools import wraps
+from fs.local_functools import wraps
 
 try:
     from cStringIO import StringIO

fs/functools.py → fs/local_functools.py

-"""A version of wraps for Python versions that don't support it"""
+"""
+
+  A version of functools.wraps for Python versions that don't support it.
+
+Note that this module can't be named "functools" because it would shadow the
+stdlib module that it tries to emulate.  Absolute imports would fix this
+problem but are only availabe from Python 2.5.
+
+"""
 
 try:
     from functools import wraps as wraps
 except ImportError:
-    wraps = lambda f: lambda f: f
\ No newline at end of file
+    wraps = lambda f: lambda f: f

fs/remote.py

@@ -29,7 +29,7 @@ from fs.wrapfs import WrapFS, wrap_fs_methods
 from fs.wrapfs.lazyfs import LazyFS
 from fs.path import *
 from fs.errors import *
-from fs.functools import wraps
+from fs.local_functools import wraps
 
 try:
    from tempfile import SpooledTemporaryFile

fs/tests/test_remote.py

@@ -17,7 +17,7 @@ from fs.remote import *
 from fs.wrapfs import WrapFS, wrap_fs_methods
 from fs.tempfs import TempFS
 from fs.path import *
-from fs.functools import wraps
+from fs.local_functools import wraps
 
 
 class TestCacheFS(unittest.TestCase,FSTestCases,ThreadingTestCases):

fs/wrapfs/__init__.py

@@ -21,7 +21,7 @@ import fnmatch
 
 from fs.base import FS, threading, synchronize
 from fs.errors import *
-from fs.functools import wraps
+from fs.local_functools import wraps
 
 
 def rewrite_errors(func):