Merge branch 'feature/header-check-v3.4' into 'master'

Resolve "Run and fix make headercheck (3.4)" (dumux-repo)

Closes #1040

See merge request !2675
6 jobs for master in 0 seconds (queued for 71 minutes and 12 seconds)
Status Name Job ID Coverage
  Trigger
passed full-dune-2.7-clang

passed full-dune-2.7-gcc

passed full-dune-master-clang

passed full-dune-master-gcc

passed minimal-dune-2.7-gcc

 
  Downstream Modules
passed trigger lecture