VR video recording, use command-line --mp4=videoname.mp4

tune gripper grasp example with tefal pan, 800Newton force.
URDF importer: if using single transform 1 child shape, don't use compound shape.
if renderGUI is false, don't intercept mouse clicks
add manyspheres.py example (performance is pretty bad, will look into it)
[pybullet] expose contactBreakingThreshold

examples/ExampleBrowser/InProcessExampleBrowser.cpp

@@ -266,6 +266,7 @@ void	ExampleBrowserThreadFunc(void* userPtr,void* lsMemory)
 				{
 					B3_PROFILE("clock.usleep");
 					clock.usleep(gMinUpdateTimeMicroSecs/10.);
+					exampleBrowser->updateGraphics();
 				} else
 				{
 					B3_PROFILE("exampleBrowser->update");