Set up partial derivatives for inverse location.

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

src/main/java/org/orekit/rugged/errors/Dump.java

src/main/java/org/orekit/rugged/errors/DumpReplayer.java

src/main/java/org/orekit/rugged/linesensor/LineSensor.java

...org/orekit/rugged/linesensor/SensorMeanPlaneCrossing.java

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

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

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

...orekit/rugged/linesensor/SensorMeanPlaneCrossingTest.java