Several changes to sync Bullet trunk with PlayStation 3 spubullet version

Still needs some cross-platform fixes

src/LinearMath/btPoolAllocator.h

@@ -57,6 +57,11 @@ public:
 		return m_freeCount;
 	}
 
+	int getUsedCount() const
+	{
+		return m_maxElements - m_freeCount;
+	}
+
 	void*	allocate(int size)
 	{
 		// release mode fix
@@ -96,6 +101,15 @@ public:
 		return m_elemSize;
 	}
 
+	unsigned char*	getPoolAddress()
+	{
+		return m_pool;
+	}
+
+	const unsigned char*	getPoolAddress() const
+	{
+		return m_pool;
+	}
 
 };