Merged changset 7337 and 7338 from ORCHIDEE_2_2 into the trunk, see ticket #821:
Simplification of soil texture processing, cf ticket #416: when using the Zobler map, the soil parameters are no more taken from 3-value "FAO" vectors in constantes_soil_var.f90, but from 13-value USDA vectors, owing to a pointer fao2usda.
No change in results but the variable njsc which changed order.