Fixed an issue with refresh on pathfinder

if a node become a result its was not being added to the result list if
the path finder was not cleared first. In most cases clearing the path
finder is not as effective as refreshing the nodes.

src/minecraft/dark/fluid/common/pump/LiquidPathFinder.java

@@ -205,10 +205,15 @@ public class LiquidPathFinder
         Iterator<Vector3> it = this.nodes.iterator();
         while (it.hasNext())
         {
-            if (!this.isValidNode(it.next()))
+            Vector3 vec = it.next();
+            if (!this.isValidNode(vec))
             {
                 it.remove();
             }
+            if(this.isValidResult(vec))
+            {
+                this.results.add(vec);
+            }
         }
         it = this.results.iterator();
         while (it.hasNext())