- DemoApplication, debug text rendering was broken, glLoadIdentity() missing

- copy user data over to child shape
- added applied impulse to btManifoldPoint
- add ContactProcessedCallback (needs test/demo)
- didn't copy over m_additionalDampingFactor into btRigidBody.

src/BulletCollision/NarrowPhaseCollision/btManifoldPoint.h

@@ -30,6 +30,7 @@ class btManifoldPoint
 		public:
 			btManifoldPoint()
 				:m_userPersistentData(0),
+				m_appliedImpulse(0.f),
 				m_lifeTime(0)
 			{
 			}
@@ -43,7 +44,8 @@ class btManifoldPoint
 					m_distance1( distance ),
 					m_combinedFriction(btScalar(0.)),
 					m_combinedRestitution(btScalar(0.)),
-					m_userPersistentData(0),					
+					m_userPersistentData(0),
+					m_appliedImpulse(0.f),
 					m_lifeTime(0)
 			{
 				
@@ -65,6 +67,7 @@ class btManifoldPoint
 
 				
 			mutable void*	m_userPersistentData;
+			btScalar		m_appliedImpulse;
 
 			int		m_lifeTime;//lifetime of the contactpoint in frames