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.

sys/msdos/setup.bat

@@ -16,10 +16,9 @@ goto err_set
 echo Checking to see if directories are set up properly ...
 if not exist ..\..\include\hack.h  goto err_dir
 if not exist ..\..\src\hack.c      goto err_dir
-if not exist ..\..\dat\wizard.des  goto err_dir
+if not exist ..\..\dat\wizard1.lua  goto err_dir
 if not exist ..\..\util\makedefs.c goto err_dir
 if not exist ..\..\win\tty\wintty.c goto err_dir
-if not exist ..\share\lev_yacc.c   goto err_dir
 echo Directories OK.
 
 if not exist ..\..\binary\* mkdir ..\..\binary