Merge branch 'develop' into issue-474

.gitattributes

.../java/org/orekit/files/ccsds/ndm/adm/aem/AemMetadata.java

...in/java/org/orekit/files/ccsds/ndm/adm/aem/AemWriter.java

...a/org/orekit/propagation/analytical/tle/TLEConstants.java

...ava/org/orekit/files/ccsds/ndm/AbstractNdmWriterTest.java

...ava/org/orekit/files/ccsds/ndm/adm/aem/AEMParserTest.java

...ava/org/orekit/files/ccsds/ndm/adm/aem/AemWriterTest.java

...ava/org/orekit/files/ccsds/ndm/adm/apm/APMParserTest.java

...ava/org/orekit/files/ccsds/ndm/adm/apm/ApmWriterTest.java

...st/java/org/orekit/gnss/metric/ntrip/NtripClientTest.java

src/test/resources/ccsds/adm/aem/AEMExample09.txt

src/test/resources/ccsds/adm/aem/AEMExample12.txt

src/test/resources/ccsds/adm/aem/AEMExample13.xml

src/test/resources/ccsds/adm/apm/APMExample6.txt

src/test/resources/gnss/ntrip/RTCM3EPH01.dat

src/test/resources/gnss/ntrip/gone.txt

src/test/resources/gnss/ntrip/orekit-test-auth.properties