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.

src/decl.c

@@ -617,7 +617,8 @@ const struct instance_globals g_init = {
     NULL, /* lev_message */
     NULL, /* lregions */
     0, /* num_lregions */
-    UNDEFINED_VALUES, /* SplLev_Map */
+    UNDEFINED_VALUES, /* SpLev_Map */
+    NULL, /* coder */
     UNDEFINED_VALUE, /* xstart */
     UNDEFINED_VALUE, /* ystart */
     UNDEFINED_VALUE, /* xsize */
@@ -629,7 +630,6 @@ const struct instance_globals g_init = {
     { UNDEFINED_PTR }, /* container_obj */
     0, /* container_idx */
     NULL, /* invent_carrying_monster */
-    { AM_CHAOTIC, AM_NEUTRAL, AM_LAWFUL }, /* ralign */
 
     /* spells.c */
     0, /* spl_sortmode */