Merge 'develop' into propagator-attitude-frame-586

NOTICE.txt

pom.xml

src/changes/changes.xml

src/main/java/org/orekit/data/ClasspathCrawler.java

src/main/java/org/orekit/errors/OrekitMessages.java

.../propagation/analytical/AbstractAnalyticalPropagator.java

...agation/analytical/FieldAbstractAnalyticalPropagator.java

src/main/java/org/orekit/propagation/events/EventState.java

...n/java/org/orekit/propagation/events/FieldEventState.java

...t/propagation/events/handlers/FieldRecordAndContinue.java

...orekit/propagation/events/handlers/RecordAndContinue.java

...ces/assets/org/orekit/localization/OrekitMessages_da.utf8

...ces/assets/org/orekit/localization/OrekitMessages_de.utf8

...ces/assets/org/orekit/localization/OrekitMessages_el.utf8

...ces/assets/org/orekit/localization/OrekitMessages_en.utf8

...ces/assets/org/orekit/localization/OrekitMessages_es.utf8

...ces/assets/org/orekit/localization/OrekitMessages_fr.utf8

...ces/assets/org/orekit/localization/OrekitMessages_gl.utf8

...ces/assets/org/orekit/localization/OrekitMessages_it.utf8

...ces/assets/org/orekit/localization/OrekitMessages_no.utf8