add a argparse.py (from py 3.2.6) that is not broken

also: remove previois attempt to fix this, installing pypi argparse into virtualenv does not work.

borg/archiver.py

@@ -1,4 +1,6 @@
-import argparse
+from .support import argparse  # see support/__init__.py docstring
+                               # DEPRECATED - remove after requiring py 3.4
+
 from binascii import hexlify
 from datetime import datetime
 from operator import attrgetter

borg/support/__init__.py

@@ -0,0 +1,16 @@
+"""
+3rd party stuff that needed fixing
+
+Note: linux package maintainers feel free to remove any of these hacks
+      IF your python version is not affected.
+
+argparse is broken with default args (double conversion):
+affects: 3.2.0 <= python < 3.2.4
+affects: 3.3.0 <= python < 3.3.1
+
+as we still support 3.2 and 3.3 there is no other way than to bundle
+a fixed version (I just took argparse.py from 3.2.6) and import it from
+here (see import in archiver.py).
+DEPRECATED - remove support.argparse after requiring python 3.4.
+"""
+

setup.py

@@ -14,12 +14,6 @@ if my_python < min_python:
 # Also, we might use some rather recent API features.
 install_requires=['msgpack-python>=0.4.6', ]
 
-if (my_python < (3, 2, 4) or
-    (3, 3, 0) <= my_python < (3, 3, 1)):
-    # argparse in stdlib does not work there due to a bug,
-    # pull a fixed argparse from pypi
-    install_requires.append("argparse>=1.4.0")
-
 
 from setuptools import setup, Extension
 from setuptools.command.sdist import sdist
@@ -161,7 +155,7 @@ setup(
         'Topic :: Security :: Cryptography',
         'Topic :: System :: Archiving :: Backup',
     ],
-    packages=['borg', 'borg.testsuite'],
+    packages=['borg', 'borg.testsuite', 'borg.support', ],
     entry_points={
         'console_scripts': [
             'borg = borg.archiver:main',