Fix Gps issues

Remove hard code for not plotting GPS channels and change height of GPS parameter to 0 so it won't plot

UPDATE Parameters SET height=0 WHERE param IN ('GNSS elevation', 'GNSS latitude', 'GNSS longitude');

Fix bug in DB about reftek GPS evelation.

UPDATE Channels SET param= GNSS elevation WHERE channel='Elevation';

This bug doesn't effect the behavior of SOHView because GPS info are collected separately and doesn't depend on DB.