added magnetic space group reference

tools/setup/convmag.cpp

@@ -427,6 +427,11 @@ bool convert_table(const char* pcInFile, const char* pcOutFile)
 	std::cout << "\n";
 
 
+	// reference for the magnetic space group data
+	prop.put("mag_groups.source", "Magnetic space group data obtained from the <a href=\"http://iso.byu.edu\">ISOTROPY Sofware Suite</a>.");
+	prop.put("mag_groups.source_url", "https://stokes.byu.edu/iso/magnetic_data.txt");
+
+
 	try
 	{
 		/*ptree::write_xml(pcOutFile, prop,