Change access levels from private to protected to facilitate

subclassing; also add new method signatures. Thanks tuco and mikkopa.
Fix Mantis #3072.

OpenSim/Region/Physics/Manager/PhysicsScene.cs

@@ -152,6 +152,12 @@ namespace OpenSim.Region.Physics.Manager
 
         public abstract bool IsThreaded { get; }
 
+        public virtual uint Raycast(PhysicsVector pos, PhysicsVector dir, float rayLength, uint ignoreId)
+        { return 0; }
+        
+        public virtual void SetMaxFlightHeight(float maxheight) { }
+        
+
         private class NullPhysicsScene : PhysicsScene
         {
             private static int m_workIndicator;