Undo/redo fully working

Normand Briere

2019-06-11 1d909ffa0c2beb51d453b53b845c4f3a749ca5f0

 KDNode.java
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..
@@ -140,7 +140,7 @@
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     protected static <T> void nnbr(KDNode<T> kd, HPoint target, HRect hr,
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             double max_dist_sqd, int lev, int K,
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             NearestNeighborList<KDNode<T>> nnl,
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-            Checker<T> checker,
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+            CheckerInterface<T> checker,
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             long timeout)
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     {
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