print sld units nm^-2

Sample/Material/MaterialBySLDImpl.cpp

@@ -70,8 +70,8 @@ std::string MaterialBySLDImpl::print() const
 {
     std::stringstream s;
     s << "MaterialBySLD:" << matName() << "<" << this << ">{ "
-      << "sld_real=" << m_sld_real << ", sld_imag = " << m_sld_imag << ", B=" << magnetization()
-      << "}";
+      << "sld_real=" << m_sld_real << ", sld_imag = " << m_sld_imag
+      << " nm^-2, B=" << magnetization() << " A/m}";
     return s.str();
 }