Changeset 6954 for branches/ORCHIDEE_2_2/ORCHIDEE/src_sechiba/thermosoil.f90

Introducing the changes of branch SP-MIP r6950.
These developments were made by Salma Tafasca durinh her PhD and allow ORCHIDEE to:
(1) read soil hydraulic parameters instead of soil texture maps (with dimension changes) or impose a uniform soil texture all over land, using keywords SPMIPEXP and EXP4;
(2) cancel the effect of roots on Ks with new keyword KFACT_ROOT_TYPE;
(3) introduce a 13th soil texture class for clay oxisols in addition to the 12 USDA classes (with thermal parameters equal to the ones of clay).
These changes to branch 2.2 have been tested in Salma's PhD simulations, and are fully compatible with former ways to control soil texture and hydraulic parameters.