Enhanced modification of Fortran namelists

In this MR several changes are incorporated.

The major one is, that Fortran namelists are now also modified with the Python routine designed to manage the yaml namelists, supporting nearly all functionality for Fortran namelists. Only the change of namelist parameters for each member is still only available for yaml namelists. This closes #87 (closed).

Further, the PREPARE_DATE job is removed as it basically did nothing (closing #108 (closed)).

Last, a variable INSTITUTE is added that is passed on to the master namelist (closing #103 (closed)).