(cherry picked from commit 9c064dd7)

Juan 13/02/2023: MNH modif for compile with sourceryg/2022.09-7-orig+OPENACC + optimization for CRAY ftn

Philippe 16/05/2023: MNM_MEM_POSITION_PIN / MNH_MEM_RELEASE: provide CNAME optional dummy argument + correct some related small problems

Philippe 01/02/2022: OpenACC: use MNH_ALLOCATE_FLAT and MNH_RELEASE_FLAT instead of old allocate/release procedures

Quentin 25/05/2021: bugfix make coherent test for pack/unpack variables for the modification of the subgrid condensation scheme

Philippe 18/12/2019: remove unnecessary dummy argument for size + remove scalar intermediate variables

The only remaining declare are in the modd_* declarations

Philippe 10/10/2019: OpenACC: replace 'declare copyin' by 'data copyin' for use-associated variables (to be standard compliant)

Philippe 03/06/2019: remove PACK/UNPACK intrinsics (to get more performance and better OpenACC support) in rain_ice(_red) subroutines

Philippe 28/01/2019: OpenACC: rain_ice_red and associated subroutines (working but with strange workarounds and bad performance)

Philippe 28/01/2019: OpenACC: rain_ice_red and associated subroutines (working but with strange workarounds and bad performance)

(cherry picked from commit bd503275)