Jureca/UseGfortran

Use gfortran compiler on JURECA

Load following modules:

module purge
module load GCC
module load ParaStationMPI
module load netCDF-Fortran

For compilation of all CLaMS program, go to the clams directory and simply type
```
make useComp=gfortran new
```

For compilation of a specific program progname in package package-name:

cd clams-directory
make distclean
make useComp=gfortran libs
cd package-name
make useComp=gfortran progname