Use lua for special level files

Game is playable, and should compile on linux and Windows.
Assumes you have a lua 5.3 library available.

Removes level compiler and associated files.
Replaces special level des-files with lua scripts.
Exposes some NetHack internals to lua:
 - des-table with commands to create special levels
 - nh-table with NetHack core commands
 - nhc-table with some constants
 - u-table with some player-specific data (u-struct)
 - selection userdata

Adds some rudimentary tests.

Adds new extended command #wizloadlua to run a specific script,
and #wizloaddes to run a specific level-creation script.

nhlib.lua is loaded for every lua script.

Download and untar lua:
  mkdir lib
  cd lib
  curl -R -O http://www.lua.org/ftp/lua-5.3.5.tar.gz
  tar zxf lua-5.3.5.tar.gz

Then make nethack normally.

dat/Arc-strt.lua

@@ -0,0 +1,113 @@
+-- NetHack 3.6	Arch.des	$NHDT-Date: 1432512784 2015/05/25 00:13:04 $  $NHDT-Branch: master $:$NHDT-Revision: 1.10 $
+--	Copyright (c) 1989 by Jean-Christophe Collet
+--	Copyright (c) 1991 by M. Stephenson
+-- NetHack may be freely redistributed.  See license for details.
+--
+--
+--	The "start" level for the quest.
+--
+--	Here you meet your (besieged) class leader, Lord Carnarvon
+--	and receive your quest assignment.
+--
+des.level_init({ style = "solidfill", fg = " " });
+
+des.level_flags("mazelevel", "noteleport", "hardfloor")
+
+des.map([[
+............................................................................
+............................................................................
+............................................................................
+............................................................................
+....................}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}.................
+....................}-------------------------------------}.................
+....................}|..S......+.................+.......|}.................
+....................}-S---------------+----------|.......|}.................
+....................}|.|...............|.......+.|.......|}.................
+....................}|.|...............---------.---------}.................
+....................}|.S.\.............+.................+..................
+....................}|.|...............---------.---------}.................
+....................}|.|...............|.......+.|.......|}.................
+....................}-S---------------+----------|.......|}.................
+....................}|..S......+.................+.......|}.................
+....................}-------------------------------------}.................
+....................}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}.................
+............................................................................
+............................................................................
+............................................................................
+]]);
+-- Dungeon Description
+des.region(selection.area(00,00,75,19), "lit")
+des.region(selection.area(22,06,23,06), "unlit")
+des.region(selection.area(25,06,30,06), "unlit")
+des.region(selection.area(32,06,48,06), "unlit")
+des.region(selection.area(50,06,56,08), "lit")
+des.region(selection.area(40,08,46,08), "unlit")
+des.region(selection.area(22,08,22,12), "unlit")
+des.region(selection.area(24,08,38,12), "unlit")
+des.region(selection.area(48,08,48,08), "lit")
+des.region(selection.area(40,10,56,10), "lit")
+des.region(selection.area(48,12,48,12), "lit")
+des.region(selection.area(40,12,46,12), "unlit")
+des.region(selection.area(50,12,56,14), "lit")
+des.region(selection.area(22,14,23,14), "unlit")
+des.region(selection.area(25,14,30,14), "unlit")
+des.region(selection.area(32,14,48,14), "unlit")
+-- Stairs
+des.stair("down", 55,07)
+-- Portal arrival point
+des.levregion({ region = {63,06,63,06}, type="branch" })
+-- Doors
+des.door("closed",22,07)
+des.door("closed",38,07)
+des.door("locked",47,08)
+des.door("locked",23,10)
+des.door("locked",39,10)
+des.door("locked",57,10)
+des.door("locked",47,12)
+des.door("closed",22,13)
+des.door("closed",38,13)
+des.door("locked",24,14)
+des.door("closed",31,14)
+des.door("locked",49,14)
+-- Lord Carnarvon
+des.monster("Lord Carnarvon", 25, 10)
+-- The treasure of Lord Carnarvon
+des.object("chest", 25, 10)
+-- student guards for the audience chamber
+des.monster("student", 26, 09)
+des.monster("student", 27, 09)
+des.monster("student", 28, 09)
+des.monster("student", 26, 10)
+des.monster("student", 28, 10)
+des.monster("student", 26, 11)
+des.monster("student", 27, 11)
+des.monster("student", 28, 11)
+-- city watch guards in the antechambers
+des.monster("watchman", 50, 06)
+des.monster("watchman", 50, 14)
+-- Eels in the moat
+des.monster("giant eel", 20, 10)
+des.monster("giant eel", 45, 04)
+des.monster("giant eel", 33, 16)
+-- Non diggable walls
+des.non_diggable(selection.area(00,00,75,19))
+-- Random traps
+des.trap()
+des.trap()
+des.trap()
+des.trap()
+des.trap()
+des.trap()
+-- Monsters on siege duty.
+des.monster("S", 60, 09)
+des.monster("M", 60, 10)
+des.monster("S", 60, 11)
+des.monster("S", 60, 12)
+des.monster("M", 60, 13)
+des.monster("S", 61, 10)
+des.monster("S", 61, 11)
+des.monster("S", 61, 12)
+des.monster("S", 30, 03)
+des.monster("M", 20, 17)
+des.monster("S", 67, 02)
+des.monster("S", 10, 19)