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/Mon-goal.lua

@@ -0,0 +1,75 @@
+-- NetHack 3.6	Monk.des	$NHDT-Date: 1432512784 2015/05/25 00:13:04 $  $NHDT-Branch: master $:$NHDT-Revision: 1.12 $
+--	Copyright (c) 1989 by Jean-Christophe Collet
+--	Copyright (c) 1991-2 by M. Stephenson
+-- NetHack may be freely redistributed.  See license for details.
+--
+-- des.level_init({ style = "solidfill", fg = " " });
+
+des.level_flags("mazelevel");
+
+des.level_init({ style="mines", fg="L", bg=".", smoothed=false, joined=false, lit=0, walled=false })
+
+des.map([[
+xxxxxx..xxxxxx...xxxxxxxxx
+xxxx......xx......xxxxxxxx
+xx.xx.............xxxxxxxx
+x....................xxxxx
+......................xxxx
+......................xxxx
+xx........................
+xxx......................x
+xxx................xxxxxxx
+xxxx.....x.xx.......xxxxxx
+xxxxx...xxxxxx....xxxxxxxx
+]]);
+-- Dungeon Description
+local place = { {14,04},{13,07} }
+local placeidx = math.random(1, #place);
+
+des.region(selection.area(00,00,25,10), "unlit")
+-- Stairs
+des.stair("up", 20,05)
+-- Objects
+des.object({ id = "lenses", coord = place[placeidx], buc="blessed", spe=0, name="The Eyes of the Overworld" })
+des.object()
+des.object()
+des.object()
+des.object()
+des.object()
+des.object()
+des.object()
+des.object()
+des.object()
+des.object()
+des.object()
+des.object()
+des.object()
+des.object()
+-- Random traps
+des.trap("fire")
+des.trap("fire")
+des.trap("fire")
+des.trap("fire")
+des.trap()
+des.trap()
+-- Random monsters.
+des.monster("Master Kaen",place[placeidx])
+des.altar({ coord = place[placeidx], align="noalign", type="altar" })
+des.monster("earth elemental")
+des.monster("earth elemental")
+des.monster("earth elemental")
+des.monster("earth elemental")
+des.monster("earth elemental")
+des.monster("earth elemental")
+des.monster("earth elemental")
+des.monster("earth elemental")
+des.monster("earth elemental")
+des.monster("xorn")
+des.monster("xorn")
+des.monster("xorn")
+des.monster("xorn")
+des.monster("xorn")
+des.monster("xorn")
+des.monster("xorn")
+des.monster("xorn")
+des.monster("xorn")