Merged in my changes from nmap-smb. The primary changes are:

* Updated the way authentication works on smb -- it's significantly cleaner now
* smb-enum-shares.nse gives significantly better output now (it checks if shares are writable)
* Added a script that checks if smbv2 is enabled on a server
* Added smb-psexec, a script for executing commands on a remote Windows server. I also included some default scripts, a compiled .exe to run everything, and a ton of documentation (in the form of NSEDoc)
* Added 'override' parameters to some of the functions in smb.lua, which lets the programmer override any field in an outgoing SMB packet without modifying smb.lua. 
* Lots of random code cleanups in the smb-* scripts/libraries

nselib/data/psexec/examples.lua

@@ -0,0 +1,69 @@
+module(... or "default", package.seeall)
+---This configuration file contains the examples given in smb-psexec.nse. 
+
+-- Any variable in the 'config' table in smb-psexec.nse can be overriden in the 
+-- 'overrides' table. Most of them are not really recommended, such as the host, 
+-- key, etc.
+overrides = {}
+overrides.timeout = 40
+
+modules = {}
+local mod
+
+mod = {}
+mod.upload           = false
+mod.name             = "Membership of 'administrators' from 'net localgroup administrators'"
+mod.program          = "net.exe"
+mod.args             = "localgroup administrators"
+table.insert(modules, mod)
+
+mod = {}
+mod.upload           = false
+mod.name             = "Example 2: Membership of 'administrators', cleaned"
+mod.program          = "net.exe"
+mod.args             = "localgroup administrators"
+mod.remove           = {"The command completed", "%-%-%-%-%-%-%-%-%-%-%-", "Members", "Alias name", "Comment"}
+mod.noblank          = true
+table.insert(modules, mod)
+
+mod = {}
+mod.upload           = false
+mod.name             = "Example 3: IP Address and MAC Address"
+mod.program          = "ipconfig.exe"
+mod.args             = "/all"
+mod.maxtime          = 1
+mod.find             = {"IP Address", "Physical Address", "Ethernet adapter"}
+mod.replace          = {{"%. ", ""}, {"-", ":"}, {"Physical Address", "MAC Address"}}
+table.insert(modules, mod)
+
+mod = {}
+mod.upload           = false
+mod.name             = "Example 4: Can the host ping our address?"
+mod.program          = "ping.exe"
+mod.args             = "$lhost"
+mod.remove           = {"statistics", "Packet", "Approximate", "Minimum"}
+mod.noblank          = true
+mod.env              = "SystemRoot=c:\\WINDOWS" 
+table.insert(modules, mod)
+
+mod = {}
+mod.upload           = false
+mod.name             = "Example 5: Can the host ping $host?"
+mod.program          = "ping.exe"
+mod.args             = "$host"
+mod.remove           = {"statistics", "Packet", "Approximate", "Minimum"}
+mod.noblank          = true
+mod.env              = "SystemRoot=c:\\WINDOWS" 
+mod.req_args         = {'host'}
+table.insert(modules, mod)
+
+mod = {}
+mod.upload           = true
+mod.name             = "Example 6: FgDump"
+mod.program          = "fgdump.exe"
+mod.args             = "-c -l fgdump.log"
+mod.url              = "http://www.foofus.net/fizzgig/fgdump/"
+mod.tempfiles        = {"fgdump.log"}
+mod.outfile          = "127.0.0.1.pwdump"
+table.insert(modules, mod)
+