Checked in some reference levels.

This relates to issue #12.  I've assembled some reference levels that
can be used to verify the parser (at least for tile data).  This should
also help for adding support for the older ".graal" format.

reference_levels/castlewarp.nw

@@ -0,0 +1,161 @@
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+BOARD 0 59 64 0 J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4
+BOARD 0 60 64 0 J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4
+BOARD 0 61 64 0 J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4
+BOARD 0 62 64 0 J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4
+BOARD 0 63 64 0 J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4J4
+LINK fbathroom.graal 31 44 2 1 27.5 49
+LINK staff1.graal 31 18 2 1 30.5 29
+SIGN 0 0
+
+       ---The Admin Tower---
+SIGNEND
+NPC - 34 28
+// NPC made by <yourname>
+if (playerenters) {
+  play dragonia.mid;
+  setbackpal pics1.png;
+}
+NPCEND
+NPC - 30 31
+// NPC made by Lunpa DaVinci
+if (playerenters&&!lunpabeentoadmintower) {
+  set lunpabeentoadmintower;
+  say 0;
+}
+NPCEND
+NPC servernpc.gif 1 2
+// NPC made by Lunpa DaVinci
+if (playerenters) {
+  putnpc nothing.gif,npcserver.txt,x,y;
+  hide;
+}
+NPCEND
+NPC - 19 23
+// NPC made by *Lunpa (DaVinci)
+if (playerenters || wasthrown) {
+  // Initialize the this. variables
+  noplayerkilling;
+  dirgo = {0,-1,-1,0,0,1,1,0};
+  timeout = 0.05;
+  this.walkmode = 1;
+  if (wasthrown && this.walkmode>1) this.walkmode = 1;
+  this.x1 = 19;
+  this.x2 = 44;
+  this.y1 = 23;
+  this.y2 = 42;
+  this.speed = 0.3;
+  this.mode = 0;
+  sprite = 0;
+  this.runcounter = int(random(10,40));
+}
+
+// Walking stuff
+if (timeout && this.mode==0) { // WALKING
+  playersprite = (playersprite%8)+1;
+  newx = playerx + dirgo[playerdir*2] * this.speed;
+  newy = playery + dirgo[playerdir*2+1] * this.speed;
+  this.runcounter--;
+  if (this.walkmode==1) { // RANDOM
+    if (this.runcounter>0) {
+      testx = newx + 1.5 + dirgo[playerdir*2];
+      testy = newy + 2+ dirgo[playerdir*2+1];
+      if (onwall(testx,testy)) {
+        playerdir = (playerdir+2)%4;
+        this.runcounter = int(random(0,60));
+      } else {
+        playerx = newx;
+        playery = newy;
+      }
+    } else {
+      this.runcounter = int(random(10,40));
+      playerdir = (playerdir+1+int(random(0,2))*2)%4;
+    }
+  } else if (this.walkmode==2) { // LEFTRIGHT
+    if (playerdir!=1 && playerdir!=3) playerdir = 3;
+    else {
+      playerx = newx;
+      playery = newy;
+      if ((playerdir==1 && x<=this.x1) || (playerdir==3 && x>=this.x2))
+        playerdir = (playerdir+2)%4;
+    }
+  } else if (this.walkmode==3) { // UPDOWN
+    if (playerdir!=0 && playerdir!=2) playerdir = 2;
+    else {
+      playerx = newx;
+      playery = newy;
+      if ((playerdir==0 && playery<=this.y1) || (playerdir==2 && playery>=this.y2))
+        playerdir = (playerdir+2)%4;
+    }
+  } else if (this.walkmode==4) { // RECTANGLE
+    playerx = newx;
+    playery = newy;
+    if ((playerdir==0 && playery<=this.y1) || (playerdir==1 && playerx<=this.x1) ||
+        (playerdir==2 && playery>=this.y2) || (playerdir==3 && playerx>=this.x2))
+      playerdir = (playerdir+3)%4;
+  }
+  if (this.walkmode>1 && this.runcounter<=0)
+    this.runcounter = 20;
+  message;
+  timeout = 0.05;
+}
+NPCEND