Test failure in windows python2.6

[jamesls]

Confirmed this only happens in windows py26. Seems to be an issue with remapping pages once we exceed the number of mapped pages.

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ERROR: test_remap_required (test_semidbm.TestRemapping)
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Traceback (most recent call last):
  File "C:\Users\Administrator\Documents\GitHub\semidbm\test_semidbm.py", line 330, in test_remap_required
    db2 = self.open_db_file()
  File "C:\Users\Administrator\Documents\GitHub\semidbm\test_semidbm.py", line 26, in open_db_file
    return semidbm.open(self.dbdir, 'c', **kwargs)
  File "C:\Users\Administrator\Documents\GitHub\semidbm\semidbm\db.py", line 461, in open
    return _SemiDBM(filename, **kwargs)
  File "C:\Users\Administrator\Documents\GitHub\semidbm\semidbm\db.py", line 73, in __init__
    self._load_db()
  File "C:\Users\Administrator\Documents\GitHub\semidbm\semidbm\db.py", line 81, in _load_db
    self._index = self._load_index(self._data_filename)
  File "C:\Users\Administrator\Documents\GitHub\semidbm\semidbm\db.py", line 92, in _load_index
    return self._load_index_from_fileobj(filename)
  File "C:\Users\Administrator\Documents\GitHub\semidbm\semidbm\db.py", line 105, in _load_index_from_fileobj
    for key_name, offset, size in self._read_index(filename):
  File "C:\Users\Administrator\Documents\GitHub\semidbm\semidbm\db.py", line 163, in _read_index
    offset=num_resizes * remap_size)
WindowsError: [Error 8] Not enough storage is available to process this command

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Ran 93 tests in 0.952s

FAILED (errors=1)

[jamesls]

Fixed in 3fec8d6bc2e866af772f9a7253891d9f176b30d9