[Feature request] Dew point feed

Hi,

I think that for people facing cold and humid winter with a heat pump, it would be nice to have a real-time frost indicator that allows analysis on heat pump icing and de-frosting.

Having one emonTH with temperature and humidity measurements available, the easiest way would be to automatically calculate the dew point as a feed.

Could this be done on emoncms.org ?

Thanks!