BulletSim: fix density since the simulator/viewer track density in a

funny unit that is 100 times real density (default 1000).
Fix avatar drifting slowly when stationary flying.
Fix for physical prims getting corrected for being under terrain when it was
just its geometric center that was below terrain.
Add PreUpdatePropertyAction allowing plugable modifiction of phys
parameters returned from Bullet.
Fix an exception setting GravityMultiplier on initialization.
Update DLLs and SOs for good measure (no functional change).

1 files changed, 2 insertions, 1 deletions

diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSPrimLinkable.cs b/OpenSim/Region/Physics/BulletSPlugin/BSPrimLinkable.cs
index 96f9762..d65d407 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSPrimLinkable.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSPrimLinkable.cs
@@ -135,7 +135,8 @@ public class BSPrimLinkable : BSPrimDisplaced
         // When going from non-physical to physical, this re-enables the constraints that
         //     had been automatically disabled when the mass was set to zero.
         // For compound based linksets, this enables and disables interactions of the children.
-        Linkset.Refresh(this);
+        if (Linkset != null)    // null can happen during initialization
+            Linkset.Refresh(this);
     }
 
     protected override void MakeDynamic(bool makeStatic)