add pybullet render API with yaw/pitch/roll option

add testrender.py file
allow option to enable OpenGL hardware renderer in multithreaded sim

b3RequestCameraImageSelectRenderer(commandHandle,ER_BULLET_HARDWARE_OPENGL);

examples/ExampleBrowser/OpenGLExampleBrowser.cpp

@@ -520,7 +520,7 @@ void MyStatusBarError(const char* msg)
 		gui2->textOutput(msg);
 		gui2->forceUpdateScrollBars();
 	}
-    btAssert(0);
+  btAssert(0);
 
 }