The output and project folder are needed for
reading the balance mesh and writing the results
of the balance calculation.

Clang format run on near-the-header lines.

Happy New Year

 in creating of the instances of classes of coupled processes.

CreatePorousMediaProperties and PorousMediaProperties is used from several processes.

This allows for correct documentation of the process_variables.

Automatically with sed
sed -i 's/ogs_file_param_attr{process/ogs_file_param_attr{prj__processes__process/g'
and similar to the ogs_file_param_special and the ogs_file_param
doxygen commands.