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/do_name.c

@@ -306,7 +306,7 @@ gloc_filter_init()
 {
     if (iflags.getloc_filter == GFILTER_AREA) {
         if (!g.gloc_filter_map) {
-            g.gloc_filter_map = selection_opvar((char *) 0);
+            g.gloc_filter_map = selection_new();
         }
         /* special case: if we're in a doorway, try to figure out which
            direction we're moving, and use that side of the doorway */
@@ -326,8 +326,8 @@ void
 gloc_filter_done()
 {
     if (g.gloc_filter_map) {
-        opvar_free_x(g.gloc_filter_map);
-        g.gloc_filter_map = (struct opvar *) 0;
+        selection_free(g.gloc_filter_map);
+        g.gloc_filter_map = (struct selectionvar *) 0;
 
     }
 }