Implement MoveFileEx or other atomic rename #57
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Implement MoveFileEx or other atomic rename
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This PR implements the Windows MoveFileEx function. This will be something that
twisted.python.lockfilecan end up using to replace some code. It's still not perfect in terms of providing atomic operations but it's the most compatible.NOTE: Atomic renames are not always possible on Windows, the point should be to make the best effort.
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