Move some codes from arome specific directory to the common one
Hack FCM to build a shared lib
Compilation of fiat through FCM

modd_* modified to enable execution with ifort
Phasing of modifications to enable PRFR option

Modules transformed into structures (rain_ice_param, rain_ice_descr, param_ice)
Both sedimentations are done
rain_ice main routine is done
Nucleation routines are done (using an elemental function)