Rain/hail totalize

[patricktokeeffe]

Table biofiltro_runs gets called from the main scan (500 ms) and Totalize() instructions apply a 1/2 scaling factor to compensate for main scan running faster than new data is queried. Except the weather station is only updated every five seconds so the scaling factor should actually be 1/10th (table called 5x2 times between successive measurements).

Alternatively, implement an inter-scan flag to ensure Totalize() is only called once, immediately after getting new measurements.