integrating opensim-git feacae173e3ec56dbb6c0f4186cee12b7a86cb23:

* Fixed avatar hovering above the ground. The avatar physics capsule was too tall.

This is related to http://opensimulator.org/mantis/view.php?id=7067 .
But that bug complains about BulletSim, and this fix is for ODE.

Signed-off-by: ft <ft@noemail>