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/unix/hints/linux

@@ -20,7 +20,8 @@ VARDIR = $(HACKDIR)
 
 POSTINSTALL=cp -n sys/unix/sysconf $(INSTDIR)/sysconf; $(CHOWN) $(GAMEUID) $(INSTDIR)/sysconf; $(CHGRP) $(GAMEGRP) $(INSTDIR)/sysconf; chmod $(VARFILEPERM) $(INSTDIR)/sysconf;
 
-CFLAGS=-g -O -I../include -DNOTPARMDECL -DDLB
+CFLAGS=-g -O -I../include -DNOTPARMDECL
+CFLAGS+=-DDLB
 CFLAGS+=-DCOMPRESS=\"/bin/gzip\" -DCOMPRESS_EXTENSION=\".gz\"
 CFLAGS+=-DSYSCF -DSYSCF_FILE=\"$(HACKDIR)/sysconf\" -DSECURE
 CFLAGS+=-DTIMED_DELAY
@@ -33,7 +34,6 @@ CFLAGS+=-DCURSES_GRAPHICS
 #CFLAGS+=-DSCORE_ON_BOTL
 #CFLAGS+=-DMSGHANDLER
 #CFLAGS+=-DTTY_TILES_ESCCODES
-#CFLAGS+=-DDLB
 
 LINK=$(CC)
 # Only needed for GLIBC stack trace: