run_gromacs.sh: add -hidden if CSG_RUNTEST
run_gromacs.sh: add -hidden if CSG_RUNTEST

MrTheodor/csg,votca/csg,junghans/csg,MrTheodor/csg,junghans/csg,MrTheodor/csg,junghans/csg,votca/csg,junghans/csg,MrTheodor/csg,junghans/csg,MrTheodor/csg,votca/csg,junghans/csg,votca/csg