Function geo_nd::quat::weighted_average_many

pub fn weighted_average_many<I: Iterator<Item = (V, [V; 4])>, V: Float>(
    values_iter: I
) -> [V; 4]

Calculate the weighted average of many unit quaternions

weights need not add up to 1, but must be nonzero

This is an approximation compared to the Landis Markley paper