Graph now displays current (most recent) value to the left of the graph
Grapher now takes data-points between two arbitrary values: don't need to be clamped between 0 and 1 necessarily
grapher stores data un-normalised, only clamping between 0 and 1 to draw. Arm elevation angle is now measured relative to spine, not the world Y axis (no cheating by leaning sideways)
now measuring the elbow angle rather than the dot product, as this should be more leggible for doctors