This is an important refactor of the way documentation generation works

* Installs luarocks WITH it's executable (easy to install other rocks if necessary)
* Use Lua supplied with luarocks
* Create Utils/luadocumentor.bat, which works with RELATIVE PATH ! -> Everybody can generate the doc
* Updated launch files accordingly

Utils/luarocks/lua/luarocks/config_cmd.lua

@@ -0,0 +1,72 @@
+--- Module implementing the LuaRocks "config" command.
+-- Queries information about the LuaRocks configuration.
+local config_cmd = {}
+
+local cfg = require("luarocks.cfg")
+local util = require("luarocks.util")
+local dir = require("luarocks.dir")
+
+util.add_run_function(config_cmd)
+config_cmd.help_summary = "Query information about the LuaRocks configuration."
+config_cmd.help_arguments = "<flag>"
+config_cmd.help = [[
+--lua-incdir     Path to Lua header files.
+
+--lua-libdir     Path to Lua library files.
+
+--lua-ver        Lua version (in major.minor format). e.g. 5.1
+
+--system-config  Location of the system config file.
+
+--user-config    Location of the user config file.
+
+--rock-trees     Rocks trees in use. First the user tree, then the system tree.
+]]
+
+local function config_file(conf)
+   print(dir.normalize(conf.file))
+   if conf.ok then
+      return true
+   else
+      return nil, "file not found"
+   end
+end
+
+--- Driver function for "config" command.
+-- @return boolean: True if succeeded, nil on errors.
+function config_cmd.command(flags)
+   if flags["lua-incdir"] then
+      print(cfg.variables.LUA_INCDIR)
+      return true
+   end
+   if flags["lua-libdir"] then
+      print(cfg.variables.LUA_LIBDIR)
+      return true
+   end
+   if flags["lua-ver"] then
+      print(cfg.lua_version)
+      return true
+   end
+   local conf = cfg.which_config()
+   if flags["system-config"] then
+      return config_file(conf.system)
+   end
+   if flags["user-config"] then
+      return config_file(conf.user)
+   end
+   if flags["rock-trees"] then
+      for _, tree in ipairs(cfg.rocks_trees) do
+      	if type(tree) == "string" then
+      	   util.printout(dir.normalize(tree))
+      	else
+      	   local name = tree.name and "\t"..tree.name or ""
+      	   util.printout(dir.normalize(tree.root)..name)
+      	end
+      end
+      return true
+   end
+   
+   return nil, "Please provide a flag for querying configuration values. "..util.see_help("config")
+end
+
+return config_cmd