Changed from grib_api to eccodes. MPI: implemented linversionout=1; fixed calculation of grid_initial fields.

Adding the full GPL license it was apparent that the FSF recommends to
have the statements as file headers

This reverts commit 3481cc18.

Code for cloud water should be correct if the total cw is stored in field clwc (old scheme) or in field qc (new scheme). Minor edits in some files.

If the 'dates' file exists on simulation start, backup to 'dates.bak' and create new file 'dates' instead of appending to it