Angle fitlering looks funny

[contradict]

At sensors.cpp, line 72, probably meant abs_angle_traversed.

Test this once we have the machine re-assembled.

[contradict]

I have decided not to fix this. I think it really is broken, but the implications of fixing it are unclear and difficult to test. The correct thing to do is re-write this whole module to use interrupt driven sampling with a simpler filter and perhaps a rolling min/max buffer. It seems to work, not a big deal right now.