format before reading/writing data from/to remote machine. This allows
different endian machines to talk to each other. Also added support for
passing time and time offset (warp) in the data packet.
FGInterface::_updateGeocentricPosition() for clarity. Also added an
FGInterface::_updateGeodeticPosition() since it is useful.
A few clean ups to native_fdm.cxx and raw_fdm.hxx.