* Documentation for load/save xml methods

* Insert the very rough beginning stubs for a save/load OpenSim archive facility that will load/save prim assets (textures & inventory) as well as the prim details themselves 
(our existing xml facilities).
* This won't be ready for even rough testing for quite some time.
* I'm doing this directly in the region server for now since this will be quicker to get something working (hence giving me the Serotonin boost that I need).  However, there are 
very good arguments for later also including it (or moving it entirely) to the separate export executable which Sean stubbed out some time ago.

OpenSim/Region/Application/OpenSimMainConsole.cs

@@ -359,6 +359,17 @@ namespace OpenSim
                         m_sceneManager.LoadCurrentSceneFromXml2(DEFAULT_PRIM_BACKUP_FILENAME);
                     }
                     break;
+                
+                case "save-oar":
+                    if (cmdparams.Length > 0)
+                    {
+                        m_sceneManager.SaveCurrentSceneToOar(cmdparams[0]);
+                    }
+                    else
+                    {
+                        m_sceneManager.SaveCurrentSceneToOar(DEFAULT_OAR_BACKUP_FILENAME);
+                    }
+                    break;   
 
                 case "plugin":
                     m_sceneManager.SendCommandToPluginModules(cmdparams);