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

data/gripper/wsg50_one_motor_gripper_new.sdf

@@ -303,6 +303,10 @@
     </joint>
     
     <link name='finger_right'>
+      <contact>
+        <spinning_friction>.3</spinning_friction>
+        <rolling_friction>0.04</rolling_friction>
+      </contact>
       <pose frame=''>0.062 0 0.145 0 0 1.5708</pose>
       <inertial>
         <mass>0.2</mass>
@@ -343,6 +347,10 @@
     </joint>
     
     <link name='finger_left'>
+      <contact>
+        <spinning_friction>.3</spinning_friction>
+        <rolling_friction>0.04</rolling_friction>
+      </contact>
       <pose frame=''>-0.062 0 0.145 0 0 4.71239</pose>
       <inertial>
         <mass>0.2</mass>