prepare_imc.sh: show warning only when multiple interactions are present
prepare_imc.sh: show warning only when multiple interactions are present

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