move the SoftBody work into its own library, BulletSoftBody (work in progress)

src/BulletDynamics/Jamfile

@@ -3,7 +3,6 @@ SubDir TOP src BulletDynamics ;
 Description bulletdynamics : "Bullet Rigidbody Dynamics" ;
 Library bulletdynamics : 
   [ Wildcard ConstraintSolver : *.h *.cpp ] 
-  [ Wildcard SoftBody : *.h *.cpp ]
   [ Wildcard Dynamics : *.h *.cpp ] 
   [ Wildcard Vehicle : *.h *.cpp ] 
 ;