functions_common.sh: fixed print of callstack in subshell
functions_common.sh: fixed print of callstack in subshell

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