[Fluxus] commits

[gabor papp]

hi,

related to this task: https://savannah.nongnu.org/task/?8341 to allow 
different gravity settings for different objects i started to extend the 
physics system a bit. i added (set_gravity_mode), which sets whether the 
body is influenced by the gravity of the world or not. (add-force), and 
(add-torque) are also added. with these you can add a force to the body 
every frame. i'm not sure if this is what you meant dave, when you wrote 
the task, but as far as i see this is how it can be done in ode.

best,
gabor