-add user definable waveforms for the periodic effects.

-unify all externals into a single forcefeedback external?

I am not sure if this is a good idea.It will make the code 
cleaner because it is closer to the hardware model, and it 
would allow intergration with the joystick object. 
But it will make patching more cumbersome.

-more testing with other iforce compatible devices
-add rumble,ramp,damper and inertia effects.
-learn autotools and autotoolize this.