ELFIN XSD now support new FILIATION element

ELFIN XSD now support new FILIATION element

New Optional XG, YG, ZG for POINT

New Optional XG, YG, ZG for POINT

Allows optional storage of GPS converted coordinates without requiring computation.
The trade off between computation and storage is an order of magnitude as of today.

5.4.0 corresponds to HyperBird version support.