Virtual stations
After some initial tries, we should move forward with the concept of virtual stations (ie spatially interpolated data transparently delivered by a call to getMeteoData()). We could create a new section for the configuration of virtual stations:
[Virtual_stations] virtualization = off ;or 2d_interpol or cones time_series = 24*3600 ;for hourly spatial interpolations
station1 = lat lon alt ; or est north alt or without alt, altitude coming from dem