Rg in the soil

Adrien Michel
2019-08-29T07:34:11Z

In the soil part, rg is not necessarily a realy physical value. E.g in bucket mode the value of 10'000 is set to use raw thermal conductivity given, instead of a computed one (see SnLaws::compSoilThermalConductivity), and in Richard mode rg just define the soil type.
However, in two locations soil rg is used as a supposed physical quantity :
- in SnLaws::compShortWaveAbsorption when MULTI_BAND is used (which is the default value)
- in ElementData::soilFieldCapacity() (not the default value in this case).
This should be somehow fixed.