2021 4th quarter WFMB flags

[wmay]

• power glitches disrupt cals for many parameters (compressor needed to be reset), 10-08 to 10-11
• undocumented NO/NOx/CO cals/maintenance, 10-05 to 10-07
• anomalous PM2.5 zero values (how to interpret other T640 channels?), 10-02 to 10-08 -- flag, and also morning 10-02
• power outage affects NO/NOx cals (pump failed), CO, 12-11 to 12-13