SMB1_Messages: SMB1 NegProt support.

New modules:
  SMB1_Messages.py - SMB1 protocol message handling (NegProt only)
  SMB_Core.py      - Common resources (SMBerror class).

These new modules provide support for marshalling/unmarshalling of SMB1
Protocol Negotiation messages (aka. NegProt).  The implementation is
fairly limited.  It is only intended to support SMB2 implementations
that allow SMB2 negotiation initiated by the SMB1 NegProt.  Go stick
that in your blender and see if it cooks.

Anyway, the SMB1_Messages.py module provides creation and parsing of
SMB_COM_NEGOTIATE request and response messages.