Wrong units in SP3 base for pos/vel and clock/rate
The SP3 header uses mm (and 10⁻⁴ mm/s) for pos/vel base accuracy, and ps (and 10⁻⁴ ps/s) for clock/rate base accuracy.
As of Orekit 12.X, these values are parsed and returned as is by the API, they should be in SI units.
It should be possible to add new getters/setters with an additional Unit
parameter and deprecate the default ones without units, making sure that they still return values with the raw non-SI units for compatibility. Then the deprecated methods should be removed in 13.0.