Merge branch 'release-candidate'

pom.xml

src/design/dsst-tesseral-contribution-class-diagram.puml

src/design/dsst-zonal-contribution-class-diagram.puml

src/main/assembly/jar-files.xml

src/main/java/org/orekit/time/GLONASSScale.java

src/main/java/org/orekit/time/QZSSScale.java

src/site/markdown/architecture/propagation.md

src/site/markdown/building.md

src/site/markdown/downloads.md

src/site/markdown/faq.md

src/site/xdoc/changes.xml