revision : toe and finger tip tracking

Latest run : proprioception of fingertips and toetips is always a good dataset for optimisation purposes. At the extremities, any instability is amplified. It turns out further that it sufficient to track digits 1-2-5 on each paw, reducing the number of tracked points to 12. This insight is interesting because it can be applied in moving systems of any kind, such as robots.

Proprioception of the head is a complementary concern, but not the main study today. Footstrike depends heavily on digits 1-2, while 5 is needed to check toe splay. For hands I favour digits 1-3-5, as it feels more balanced.