Mantis#3218. Thank you kindly, TLaukkan (Tommil) for a patch that:

* Added log4net dependency to physxplugin in prebuild.xml.
* Added missing m_log fields to classes.
* Replaced Console.WriteLine with appropriate m_log.Xxxx
* Tested that nant test target runs succesfully.
* Tested that local opensim sandbox starts up without errors.

OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs

@@ -526,7 +526,7 @@ namespace OpenSim.Region.Framework.Scenes
                         }
                         else
                         {
-                            Console.WriteLine("found unexpected element: " + reader.Name);
+                            m_log.Warn("found unexpected element: " + reader.Name);
                             reader.Read();
                         }
                         break;