- added quickSort to btAlignedObjectArray (has generally better performance then heapSort)

- replaced all usage of heapSort by quickSort
- finished btMultiSapBroadphase. Still some work to be done to increase performance (faster add/remove from child broadphases. 
  uses currently AABB tree to locate child broadphase (should use grid), and sorted array takes too much time.

src/BulletCollision/CollisionDispatch/btUnionFind.cpp

@@ -77,8 +77,7 @@ void	btUnionFind::sortIslands()
 	
 	 // Sort the vector using predicate and std::sort
 	  //std::sort(m_elements.begin(), m_elements.end(), btUnionFindElementSortPredicate);
-	//perhaps use radix sort?
-	  m_elements.heapSort(btUnionFindElementSortPredicate());
+	  m_elements.quickSort(btUnionFindElementSortPredicate());
 
 }