Add final for methods arg; private when possible

.../java/org/orekit/rugged/adjustment/AdjustmentContext.java

...t/rugged/adjustment/GroundOptimizationProblemBuilder.java

...ava/org/orekit/rugged/adjustment/LeastSquareAdjuster.java

src/main/java/org/orekit/rugged/refining/measures/Noise.java

...java/org/orekit/rugged/refining/measures/Observables.java

...va/org/orekit/rugged/refining/measures/SensorMapping.java

...rekit/rugged/refining/measures/SensorToGroundMapping.java

src/tutorials/java/RefiningPleiades/GroundRefining.java

src/tutorials/java/RefiningPleiades/InterRefining.java

src/tutorials/java/RefiningPleiades/Refining.java

...ls/java/RefiningPleiades/models/PleiadesViewingModel.java