Resolve "Renaming the Satellite object into Spacecraft"

See merge request orekit/oreczml!52

Corrections applied to some tutorials where builders were not used.

Corrections applied to some tutorials where builders were not used.

Corrections applied to some tutorials where builders were not used.

Resolve "Add station visibility "circle" in 2D mode"

See merge request orekit/oreczml!51

Resolve "Add station pass visualisation in 3D mode"

See merge request orekit/oreczml!50

Changed the .gitmodules to point to the orekit data oreczml that will not change.