LuaSynced*:
  add Spring.SetUnitPosErrorParams(number unitID,
    number posErrorVector.x, number posErrorVector.y, number posErrorVector.z,
    number posErrorDelta.x, number posErrorDelta.y, number posErrorDelta.z
    [ , number nextPosErrorUpdate]) --> nil
  add Spring.GetUnitPosErrorParams(number unitID) --> nil |
    number posErrorVector.x, number posErrorVector.y, number posErrorVector.z,
    number posErrorDelta.x, number posErrorDelta.y, number posErrorDelta.z,
    number nextPosErrorUpdate