Add Junit for test coverage of Rugged for new method distanceBetweenLOS

src/test/java/org/orekit/rugged/TestUtils.java

src/test/java/org/orekit/rugged/api/RuggedTest.java

.../java/org/orekit/rugged/utils/RefiningLiaisonMetrics.java

src/test/java/org/orekit/rugged/utils/RefiningTest.java

...s/java/fr/cs/examples/refiningPleiades/InterRefining.java

...va/fr/cs/examples/refiningPleiades/models/OrbitModel.java