SGP/SMOS/E1 - Humidity data invalid

The RH sensor reported proper values when installed, but the values 
drifted upwards until they exceeded our tolerances.

All RH and vapor pressure data taken prior to 1630 GMT on 29 NOV 95,
when the probe was replaced, should be flagged as incorrect.

• Relative Humidity (hybrid-b grid)(rh)
• Standard Deviation of Relative Humidity(sd_rh)
• Standard deviation of vapor pressure(sd_vap_pres)
• Vapor Pressure (kiloPascals)(vap_pres)

• Time of minimum vapor pressure(time_min_vap_pres)
• Daily minimum vapor pressure(min_vap_pres)
• Time of maximum relative humidity(time_max_rh)
• Minimum Relative Humidity(min_rh)
• Time of maximum vapor pressure(time_max_vap_pres)
• Time of Relative Humidity(time_min_rh)
• Daily maximum relative humidity(max_rh)
• Maximum Vapor Pressure(max_vap_pres)

• Relative Humidity (hybrid-b grid)(rh)
• Vapor Pressure (kiloPascals)(vap_pres)