Re #8107. Only add listeners by name in debug builds.

Now that live data is becoming more mature & prominent, we should tidy
up the interface by removing the specific listener names from the list
of instruments that the user sees . They were just there for
development/testing purposes, and as such I'm leaving them in for debug
builds.

Code/Mantid/Framework/LiveData/src/LiveDataAlgorithm.cpp

@@ -49,9 +49,11 @@ namespace LiveData
         instruments.push_back( it->name() );
       }
     }
-    // TEMPORARY: Add all the listeners by hand while this is all under development
+#ifndef NDEBUG
+    // Debug builds only: Add all the listeners by hand for development testing purposes
     std::vector<std::string> listeners = Mantid::API::LiveListenerFactory::Instance().getKeys();
     instruments.insert( instruments.end(), listeners.begin(), listeners.end() );
+#endif
     declareProperty(new PropertyWithValue<std::string>("Instrument","", boost::make_shared<StringListValidator>(instruments)),
         "Name of the instrument to monitor.");