Webots 4.0.20 available for download

Hi,

A new release of Webots tagged 4.0.20 is available for download. It 
includes many improvements and bug fixes. I would recommand every Webots 
4 user to upgrade to this new release:

http://www.cyberbotics.com/products/webots/download.html

Here is the ChangeLog for this new release since release 4.0.19.

-Olivier

    * Fixed crash caused by the transformation of a device node to a
      Group node in the scene tree window
    * Added the gps_euler function in the C and Java API, this is useful
      to simulate a compass and two inclinometers (thanks to Mike Jost)
    * Added ODE include files to compile ODE shared library (thanks to Dave)
    * Included the latest Hemisson firmware in controllers/botstudio
    * Added RB0 input and RB6/RB7 outputs to BotStudio (thanks to Rémi)
    * Added boebot.wbt demo (thanks to Sébastien)
    * Added a preliminary model of Aibo ERS-7
    * Added crawling, walking and swimming salamander.wbt demo (thanks
      to Jérôme)
    * Fixed slow down bug with selection of IndexedFaceSet nodes
    * Fixed the name for physics libraries which was locked to
      sample.dll (thanks to Alexis)
    * Fixed Khepera gripper presence sensor with a real gripper (thanks
      to Fernando)
    * Added the capability to talk with a real Khepera from a robot
      controller using the Khepera protocol (thanks to Jose)
    * Fixed crash with khepera_gripper.wbt and real Khepera robots
      (thanks to Fernando)
    * Implemented a multi-thread API in C with mutexes.
    * All Webots API functions are now MT-safe for use with
      multi-threaded controllers
    * Fixed the choice of geometry primitives in the scene tree window
      (thanks to Sébastien)
    * Disabled OpenGL vertical sync on Windows for a much faster 3D
      rendering: I get a 4x performance increase on my laptop (thanks to
      Jean-Christophe)
    * Fixed crash due to ODE stack overflow when handling complex models
      with physics
    * Fixed issue in physics shared library with dGeomGetBody on a
      non-placeable geom (thanks to Jérôme)
    * BotStudio 2.0.7: fixed quit without saving french message and
      sensors measurement display
    * Fixed bug with dWebotsGetGeomFromDEF() and nested structures with
      servos (thanks to Jérôme)




 
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