[MRG] refact LLA

...it/rugged/refining/generators/GroundMeasureGenerator.java

...kit/rugged/refining/generators/InterMeasureGenerator.java

...ava/org/orekit/rugged/refining/metrics/DistanceTools.java

...g/orekit/rugged/refining/metrics/LocalisationMetrics.java

...d/refining/metrics/SensorToSensorLocalisationMetrics.java

...g/orekit/rugged/refining/models/PleiadesViewingModel.java

...utorials/java/AffinagePleiades/AffinageRuggedLiaison.java

src/tutorials/java/AffinagePleiades/GroundRefining.java

src/tutorials/java/AffinagePleiades/InterRefining.java

src/tutorials/java/AffinagePleiades/Refining.java