Reorganized source tree.

.gitignore

...src/main/java/org/orekit/rugged/geotiff/AngulerUnits.java

...rc/main/java/org/orekit/rugged/geotiff/AsterMessages.java

...main/java/org/orekit/rugged/geotiff/AsterTileUpdater.java

...f/src/main/java/org/orekit/rugged/geotiff/GeoTiffDEM.java

.../resources/assets/org/orekit/rugged/AsterMessages_en.utf8

.../resources/assets/org/orekit/rugged/AsterMessages_fr.utf8

...est/java/org/orekit/rugged/geotiff/AsterMessagesTest.java

.../java/org/orekit/rugged/geotiff/AsterTileUpdaterTest.java

...c/test/java/org/orekit/rugged/geotiff/GeoTiffDEMTest.java

...sources/org/orekit/rugged/geotiff/ASTER-files-warning.txt