Use smbclient so that it is possible to connect to Win7 systems.

The old code does not support the newer security models required for
interoperability with Windows. Switch to smbclient, which works better
and can be upgraded independently as required.
Merge branch 'smbclient'
Merge pull request #11 from beyonwiz/master

Use smbclient so that it is possible to connect to Win7 systems.