Temperature Conversions added.
-Kelvin to Celcius
-Celcius to Farhenheit
-Farhenheit to Celcius
getQFE modified to use new atmosphere function to return pressure. Will
use QNH as defined in editor to figure out QFE if function doesn't
return anything.
added mist.utils.converter() and shortcut mist.converter().
This function is a shortcut based method of converting a coordinate from
one format to another. Conversions exist for distance, temperature,
pressure, and speed. I may need to double check some conversions. :)
