OpenGeoSys Release 6.3.0

Changelog references update.

OpenGeoSys Release 6.2.1

OpenGeoSys 6.2.0

[Jenkins] Fixed release build.

[Jenkins] Fixed slow PETSc builds on envinf1.

Merge pull request ufz#2019 from wenqing/fixing

Added a missed parameter documentation and ran clang-tidy for some files

Added tag for insitu PR.

OpenGeoSys Release 6.0.8

Merge pull request ufz#1463 from chleh/improve-docu-part5

Documentation