Allow input in radians for Karney's geodesic methods #2
Description
Currently, Karney's geodesic methods support input in degrees, whereas, the formulas currently implemented in Boost Geometry take input in radians (see boostorg/geometry#486).
This issue is a reminder to modify Karney's method to allow input in radians. This might lead to performance improvements, since there will less conversions (i.e. divisions / multiplications) involved.