SGP/IRSI/C1 - Reprocess: IR sky cover

The IR-derived fractional sky cover values appear to be positively biased. The problem was 
corrected when the computer was restarted following scheduled software and security 
patch updates.

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• High emission sky cover for narrow field of view(sky_cover_high_emission_narrow)
• High emission sky cover for wide field of view(sky_cover_high_emission_wide)
• Low emission sky cover for wide field of view(sky_cover_low_emission_wide)
• Low emission sky cover for narrow field of view(sky_cover_low_emission_narrow)