Fix ungroup.

Normand Briere

2019-06-29 a69bb4474a3264a9a7a7f8b8d8154ea771f167c8

 KDNode.java
..
..
@@ -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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