BulletSim: Add Force* operations to objects to allow direct push to engine.

Update BSDynamics to use same (don't want to delay updates til next taint-time.
Suppress queuing a taint update for position and orientation calls if value
    does not change.
Move Bullet timing statistics call from C# back to C++ code.
Throttle taints per simulation step and add parameter to set.
By default, don't create hulls for physical objects. Add a
    parameter to turn on and off.

OpenSim/Region/Physics/BulletSPlugin/BSShapeCollection.cs

@@ -407,7 +407,7 @@ public class BSShapeCollection : IDisposable
         //     made. Native shapes are best used in either case.
         if (!haveShape)
         {
-            if (prim.IsPhysical)
+            if (prim.IsPhysical && PhysicsScene.ShouldUseHullsForPhysicalObjects)
             {
                 // Update prim.BSShape to reference a hull of this shape.
                 ret = GetReferenceToHull(prim, shapeData, pbs, shapeCallback);