Pysmb

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- Fix bug which results in endless loop in SMBConnection when remote CIFS
server closes the connection.

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- Improve queryIPForName() in nmb.NetBIOS and nmb.NBNSProtocol class to
return only server machine name and ignore workgroup names.

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- Adds support for Python3. Noted that the Python3 SMB/NMB protocol implementations
for Twisted are not well-tested as Twisted (as of v12.1) is not Python3 ready yet.
- Adds support for retrieving list of shadow copies (also known as
"previous versions" in Windows). Note that not all Windows editions support shadow
copies.

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- Adds SMB2 protocol implementation with signing for outgoing SMB2 messages.
pysmb will utilize SMB2 protocol with servers that support SMB2
(eg. Windows Vista, Windows 7 and Samba 3).
If the remote server does not support SMB2, pysmb will fall back automatically
to using SMB1 protocol.

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- Add supports for SMB message signing. pysmb will sign all SMB messages from
the CIFS client to the server, but it does not verify the signatures of the
SMB messages from the server.

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- Adds support for "smb://" URL in urllib2 python packages to retrieve or upload
files from/to remote CIFS servers.
- Improve documentation