Reorganized packages.

design/direct-location-class-diagram.puml

design/initialization-class-diagram.puml

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

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

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

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

...va/org/orekit/rugged/intersection/BasicScanAlgorithm.java

...va/org/orekit/rugged/intersection/IgnoreDEMAlgorithm.java

...org/orekit/rugged/intersection/IntersectionAlgorithm.java

...kit/rugged/intersection/duvenhage/DuvenhageAlgorithm.java

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

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

...java/org/orekit/rugged/linesensor/LinearLineDatation.java

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

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

...ava/org/orekit/rugged/linesensor/SensorPixelCrossing.java

src/main/java/org/orekit/rugged/los/FixedLOS.java

src/main/java/org/orekit/rugged/los/TimeDependentLOS.java

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

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