Intercrevapor computed with Rn from met

[VEZY]

Intercrevapor, the evaporation from the leaves -i.e. the precipitation intercepted by leaves and re-evaporated- is computed using the net radiation computed in the meteorology with Allen et al. (1998) equations. This should be replaced by an Rn computed by the model.
The difficulty is that Rn can only be computed knowing Intercrevapor, so an iteration process is needed. We could maybe find another equation to avoid that because it will increase the computation time that is already long.