BulletSim: Added avatar capsule scaling for size of avatar.

This also fixes computation of avatar mass.
Added parameter MaxPersistantManifoldPoolSize.
Fixed a parameter setting bug which caused crashes of there were
  more than 400 or so physical objects. I tested up to 5000.
Updated BulletSim DLLs and SOs.

OpenSim/Region/Physics/BulletSPlugin/BulletSimAPI.cs

@@ -158,6 +158,7 @@ public struct ConfigurationParameters
 	public float avatarContactProcessingThreshold;
 
 	public float maxPersistantManifoldPoolSize;
+	public float maxCollisionAlgorithmPoolSize;
 	public float shouldDisableContactPoolDynamicAllocation;
 	public float shouldForceUpdateAllAabbs;
 	public float shouldRandomizeSolverOrder;