SGP/IRT/C1 - Contamination of 25M lens

The IRT exhibited a positive bias compared to PIR. The problem was corrected by cleaning 
the lens.

• Surface Infra-Red Temperature, Maxima(sfc_ir_temp_max)
• Instantaneous Surface Infra-red Temperature(inst_sfc_ir_temp)
• Surface infra-red temperature(sfc_ir_temp)
• Surface Infra-Red Temperature, Minima(sfc_ir_temp_min)
• Surface Infra-Red Temperature, Standard Deviation(sfc_ir_temp_std)