functions_inverse.sh: nicer error messages
functions_inverse.sh: nicer error messages

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