Deleted the Aster module and convert Rugged to mono-module.

.gitignore

aster/pom.xml

...r/src/main/java/org/orekit/rugged/aster/AngularUnits.java

.../src/main/java/org/orekit/rugged/aster/AsterMessages.java

...c/main/java/org/orekit/rugged/aster/AsterTileUpdater.java

aster/src/main/java/org/orekit/rugged/aster/GeoKey.java

...g/orekit/rugged/aster/GeographicCoordinateSystemType.java

aster/src/main/java/org/orekit/rugged/aster/LinearUnits.java

aster/src/main/java/org/orekit/rugged/aster/ModelType.java

aster/src/main/java/org/orekit/rugged/aster/RasterType.java

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

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

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

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

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

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

.../test/java/org/orekit/rugged/aster/AsterMessagesTest.java

...st/java/org/orekit/rugged/aster/AsterTileUpdaterTest.java

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

core/pom.xml