WindChecker sketch contains mistakes

There are a few fixes needed in WC machine:

1. Rename No to NotWindy
2. In going up from NotWindy --> CheckPersistance --> Windy include threashold: wind_speed >= WIND_SPEED_THREASHOLD
3. In going down to NotWindy from Windy, use wind_speed < WIND_SPEED_THREASHOLD - DELTA
4. In going down to NotWindy from CheckPersistance, use wind_speed < WIND_SPEED_THREASHOLD
5. In going down to NotWindy from CheckPersistance, use ck >= t1