Add radians as new angle unit
In line with !128 (merged), one considers radians as the reference unit for angles. microradians, milliradians and radians are added to the angle category, and radians are set as the reference (with respect to the SI).
In line with !128 (merged), one considers radians as the reference unit for angles. microradians, milliradians and radians are added to the angle category, and radians are set as the reference (with respect to the SI).