All modd_* replaceed by structures in ICE3

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

Adaptation of mode_ice4_compute_pdf
Revisit of nucleation

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)

Structures for modd_cst, modd_budget, modd_neb and modd_rain_ice_param
New structure for array dimensions

Not totally finished because of the interface of compute_updraft_rhcj01
that is not definitive.
PDX and PDY must be passed to the routine from aro_shallow, arp_shallow
and phys_param

compute_updraft and compute_updraft_raha are OK
for compute_updraft_rhcj10: waiting for a answer from Rachel and/or Yves

+ compute_bl89_ml as a mode_

+ correction mf_turb_expl.F90

Replacement of modd_mfshall in AROME by modd_param_mfshall
Merge mf_turb_expl

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.

Merge arome rain_ice with:
- Ryad's versio: optimisation, KPROMA blocs
- Meso-NH version: subgrid precipiation
Arome aux:
- mode_ll to provide get_indice_ll
- mode_budget

Known issues:
- Bug around KPROMA blocs: results are different when used
- precipitation fraction cannot be used as long as condensation is not merged
- mode_ice4_sedimentation_momentum is still not plugged

merge AROME, Meso-NH and Ryad's version
cleaning of forgotten modi
tools.f90 added from Meso-NH package

Modifications prepared by Ryad are stored in arome/modset_Ryad
To help the merging of ice4_fast_ri, the array syntax was replaced
by a DO loop

gradient* files are merged and moved in externals
shuman moved in externals
modification of arguments order for shuman and gradients

rename rmc01.f90 into rmc01.F90

- mv *.f90 *.F90
- bug corrections in bl89 and compute_bl89_ml
- code modification to take into account the new interface of
bl89 and compute_bl89_ml
- introduction of the REPRO48 compilation key