Parse OEM without planetary ephemerides
As a user I would like to load an Earth centered OEM file when I don't have a planetary ephemerides file so I don't have to worry about that large auxiliary data file.
In Orekit 10 it was possible to parse and OEM file without loading any planetary ephemerides (e.g. lnxp files). In Orekit 11 it seems the planetary ephemerides are required for loading any OEM file, even one centered on Earth. After looking through the code it appears that the only value used from the 15 MB file is Earth's standard gravitational parameter. It would be a nice feature to be able to parse an OEM without needing planetary ephemerides. This would be user friendly in the sense that there would be less configuration required and less storage space required for the large planetary ephemerides file.
Based on the code structure it is unclear to me what the least intrusive way is to not require a planetary ephemeris file for Earth centered trajectories. Suggestions welcome.