Fixed computation of min/max when some cells are Double.NaN.

src/main/java/org/orekit/rugged/api/Rugged.java

.../orekit/rugged/intersection/duvenhage/MinMaxTreeTile.java

src/main/java/org/orekit/rugged/raster/SimpleTile.java

src/main/java/org/orekit/rugged/utils/MaxSelector.java

src/main/java/org/orekit/rugged/utils/MinSelector.java

src/main/java/org/orekit/rugged/utils/Selector.java

src/test/java/org/orekit/rugged/errors/DumpManagerTest.java

src/test/java/org/orekit/rugged/errors/DumpReplayerTest.java

src/test/java/org/orekit/rugged/raster/SimpleTileTest.java

src/test/resources/replay/replay-direct-loc-01.txt