Counting and saving of Dew Point

Activies of weekend included a DewPoint -project. Here's a short summary:

1. Added to the end of 'WeatherData' table a new column named 'DewPoint'
2. Made changes to 'pclogging.py' program, so that dew point has to be calculated only once. Additions (excluding INSERT clause and it's preparation) to code were:

   from math include log
        . . .
                  OutTemp = CWJSON["OutdoorTemperature"]
                  OutHum  = CWJSON["OutdoorHumidity"]
                  SA_DewPoint = ( OutTemp  - (( 100 - OutHum ) / 5 ))      # Simple approximation NOT USED ANYWHERE
                  GammaTRH = round ((( log ( OutHum / 100 ) + (( 18.678 * OutTemp ) / ( 257.14 + OutTemp ))), 4)
                  DewPoint = round ((( 257.14 * GammaTRH ) / ( 18.678 - GammaTRH )), 2)
                  state.DewPoint = DewPoint

3.  Added  print -command after each line above

Log file 'nohup.out' contained after that for example lines (situation before row was inserted)

   Outdoor Temperature = 10.22
   Outdoor Humidity = 48
   Simple approximation of Dew Point = -0.17999......
   GammaTRH = -0.02
   Dew Point = -0.28
   state Dew Point = -0.28

New 'Dew Point' -graph was also added, during which negative 'Dew Point' values forced to do also following additions/changes to 'weather_page.py' file:

    if ( min ( DewPoint ) < 0):
         minDewTemp = min ( DewPoint ) * 1.10
    else:
         minDewTemp = min ( DewPoint ) * 0.9
    maxDewTemp = max ( DewPoint ) * 1.10

Calculated values above were used to set yaxes to graph