Fixed the path finding algos a bit

src/zutil/algo/path/PathNode.java

@@ -1,17 +1,36 @@
 package zutil.algo.path;
 
+import java.util.LinkedList;
+
 
 public interface PathNode {
 
-	public void setVisited(boolean b);
-	
-	public boolean visited();
-	
+	/**
+	 * @return an Iterator with all its neighbors
+	 */
 	public Iterable<PathNode> getNeighbors();
 	
+	/**
+	 * @param neighbor is the neighbor
+	 * @return the cost to the neighbor
+	 */
 	public int getNeighborCost(PathNode neighbor);
 	
-	public void setSourceNeighbor(PathNode neighbor);
+	/**
+	 * Sets the parent node to this one
+	 */
+	public void setParentNeighbor(PathNode parent);
 	
-	public PathNode getSourceNeighbor();
+	/**
+	 * @return the parent node
+	 */
+	public PathNode getParentNeighbor();
+	
+	/**
+	 * Traverses the parent tree and returns the path.
+	 * 
+	 * @param goal is the node to reach
+	 * @return the path to the goal, empty list if there is no goal
+	 */
+	public LinkedList<PathNode> traversTo(PathNode goal);
 }