Version 0.7

• special max algorithm for ww and wawa
• aggregation type wmo_W1, wmo_W2, wmo_Wa1 and wmo_Wa2
• frost indicator according to German Weather Service DWD
• observation type frostIndicator
• handle firmware error of Ott Parsivel2 that erroneously produces ww62
• AWEKAS support
• divide PrecipThread.presentweather() into 2 parts
• replace special accumulators by providing the archive record by the thread
• changed detection of erroneous readings
• added presentweatherWw and presentweatherWawa