Converted logging to use log4net.

Changed LogBase to ConsoleBase, which handles console I/O.
This is mostly an in-place conversion, so lots of refactoring can still be done.

OpenSim/Region/Environment/Scenes/SceneObjectGroup.cs

@@ -1003,9 +1003,9 @@ namespace OpenSim.Region.Environment.Scenes
             }
             else
             {
-                MainLog.Instance.Verbose("SCENE",
+                m_log.Info(String.Format("[SCENE]: " +
                                          "DelinkFromGroup(): Child prim local id {0} not found in object with root prim id {1}",
-                                         partID, LocalId);
+                                         partID, LocalId));
             }
         }