Merge branch 'master' of https://www.orekit.org/git/rugged-main

pom.xml

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

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

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

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

src/main/java/org/orekit/rugged/utils/ExtendedEllipsoid.java

...ava/org/orekit/rugged/utils/SpacecraftToObservedBody.java

src/site/markdown/tutorials/direct-location-with-DEM.md

src/site/markdown/tutorials/direct-location.md

src/site/markdown/tutorials/inverse-location.md

...java/org/orekit/rugged/raster/RandomLandscapeUpdater.java

...org/orekit/rugged/utils/SpacecraftToObservedBodyTest.java

src/tutorials/java/fr/cs/examples/DirectLocation.java

src/tutorials/java/fr/cs/examples/DirectLocationWithDEM.java

src/tutorials/java/fr/cs/examples/InverseLocation.java