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/drives.lua

@@ -0,0 +1,50 @@
+module(... or "drive", package.seeall)
+---This configuration file pulls info about a given harddrive
+
+-- 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             = "Drive type"
+mod.program          = "fsutil"
+mod.args             = "fsinfo drivetype $drive"
+mod.req_args         = {"drive"}
+mod.maxtime          = 1
+table.insert(modules, mod)
+
+mod = {}
+mod.upload           = false
+mod.name             = "Drive info"
+mod.program          = "fsutil"
+mod.args             = "fsinfo ntfsinfo $drive"
+mod.req_args         = {"drive"}
+mod.replace          = {{" :",":"}}
+mod.maxtime          = 1
+table.insert(modules, mod)
+
+mod = {}
+mod.upload           = false
+mod.name             = "Drive type"
+mod.program          = "fsutil"
+mod.args             = "fsinfo statistics $drive"
+mod.req_args         = {"drive"}
+mod.replace          = {{" :",":"}}
+mod.maxtime          = 1
+table.insert(modules, mod)
+
+mod = {}
+mod.upload           = false
+mod.name             = "Drive quota"
+mod.program          = "fsutil"
+mod.args             = "quota query $drive"
+mod.req_args         = {"drive"}
+mod.maxtime          = 1
+table.insert(modules, mod)
+