1. Include barycentric correction for the Sun in get_BC_vel() and exposure_meter_BC_vel(), by using SolarBarycentricCorrection() function. We also include a ReflectedLightBarycentricCorrection() function for reflected light observations of Solar system objects to measure Solar RVs, based on the same principles as the Solar barycentric correcction. However, this last Reflected light routine has not been tested yet.
2. Switch from using Scipy constants to Astropy constants.
3. Cache File IO for Leap second management.
4. Predictive mode.
5. Include PhysicalConstants module