Extend index function "interday_diurnal_temperature_range" to take a reducer as argument
This extension would enable e.g. maximum
as an alternative reducer to the currently hardcoded mean
. Such an index would be relevant as indicator of major day-to-day shifts in weather. e.g. one day overcast and only little difference between day and night temperatures, and the next day clear skies with a large difference between a warm daytime temperatures and cool nighttime temperatures.
Cf. clix-meta #89