Shaped and themed rooms

Allows creating shaped or themed rooms for the Dungeons of Doom
via lua script.

Invalidates bones and saves.

Makefiles updated for unix/linux by adding themerms.lua, but other
OSes need to have that added.

src/save.c

@@ -1079,11 +1079,17 @@ free_dungeons()
 {
 #ifdef FREE_ALL_MEMORY
     NHFILE tnhfp;
+    int i;
 
     zero_nhfile(&tnhfp);    /* also sets fd to -1 */
     tnhfp.mode = FREEING;
     savelevchn(&tnhfp);
     save_dungeon(&tnhfp, FALSE, TRUE);
+    for (i = 0; i < g.n_dgns; i++)
+        if (g.dungeons[i].themelua) {
+            lua_close(g.dungeons[i].themelua);
+            g.dungeons[i].themelua = (lua_State *) 0;
+        }
 #endif
     return;
 }