gummi-arm-control

TODO

express marker position in space as quaternion
- will be possible to measure arm position from any place
- will be possible to estimate how confident is the readout
add mapping: (angle, stiffness) -> (confidence)
build neural network
- use Levenberg-Marquardt backpropagation with single hidden layer
use histograms to estimate how good is the readout
use logger instead of printing