mode_compute_frac_ice becomes an include file which must be used
in contains section of subroutines through an #include or a fortran
INCLUDE

OCND2 included in common code (from AROME version)
OCND2 specific code moved in common/micro or arome/dead_code directories
High/Low cloud included for condensation (from Méso-NH version)
Harmonie SPP code moved outside of physics
condensation and ice_adjust optimised by Ryad
compute_frac_ice as an elemental procedure

The 3 routines are merged into mode_compute_frac_ice
using optimisation (with pointers) developped by Ryad.