Compilation of preprocessing scripts

I have added a couple of scripts that are mean to compile geo.F90 (for grid selection) and preglobo_new.F90 (in order to read and rearrange the input files for the model initial/boundary conditions).

In order for this task to be accomplished (and the merge request to be accepted in devel/compilenv) the following issues have to be solved:

• Grib_APIs have to be installed in the local installation of the model (this can be easily solved by downloading them and building them wherever needed, using the quick installation guide provided by ECMWF);
• It would be waaay more informative if, as suggested here we would be able to compile with Ncargf77 and see what grid we are working with before we run the model. For this, we need a recent installation of ncargf77;
• preglobo_new.F90 won't ever compile if we do not get the read_grib2_data.F90 file (see here);