[ODE] new in svn: test_feedback.cpp

[Bram Stolk]

Hi,


I added ode/test/test_feedback.cpp to SVN trunk.
It demonstrates the use of joint feedbacks.

A screenshot is at SF:
https://sourceforge.net/project/screenshots.php?group_id=24884&ssid=41151

   Bram

PS: I did not touch the win32 build system, in fear of breaking it, as I cannot
    test it.