[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

added changes since last version to changelog

[TES] chaged reaction taming strategy

Merge pull request ufz#1128 from chleh/cleanup-geotype

Cleanup GEOTYPE

Update changelog.

Update .clang-format.