First commit of 2008, Happy New Year!

Add option to compile without btClock and without profiling: comment out USE_BT_CLOCK, and #define BT_NO_PROFILE
Fixed typo/case in #include "LinearMath/btQuickProf.h", in SpuParallelSolver.cpp
Removed unnecessary files from libxml CMakeLists.txt

Demos/OpenGL/DemoApplication.h

@@ -44,8 +44,9 @@ class DemoApplication
 	class CProfileIterator* m_profileIterator;
 
 	protected:
-
+#ifdef USE_BT_CLOCK
 	btClock m_clock;
+#endif //USE_BT_CLOCK
 
 	///this is the most important class
 	btDynamicsWorld*		m_dynamicsWorld;
@@ -127,6 +128,16 @@ public:
 		return m_cameraTargetPosition;
 	}
 
+	btScalar	getDeltaTimeMicroseconds()
+	{
+#ifdef USE_BT_CLOCK
+		btScalar dt = m_clock.getTimeMicroseconds();
+		m_clock.reset();
+		return dt;
+#else
+		return btScalar(16666.);
+#endif
+	}
 
 	///glut callbacks