Fix merge from master

App/src/TestIsGISAXS4.cpp

@@ -70,7 +70,7 @@ void TestIsGISAXS4::finalise()
         c1->cd(3);
         IsGISAXSTools::setMinimum(-0.0001);
         IsGISAXSTools::setMaximum(0.0001);
-        IsGISAXSTools::drawOutputDataDifference2D(*our_data, *isgi_data, "CONT4 Z", "2D Difference map");
+        IsGISAXSTools::drawOutputDataRelativeDifference2D(*our_data, *isgi_data, "CONT4 Z", "2D Difference map");
 
         // difference
         c1->cd(4);