Juan 26/08/2020:rain_ice_fast_rs.f90, managed DO CONNCURRENT LOCAL , not supported on ifort with ifdef MNH_OPENACC && !_FAKEOPENACC

Juan 12/08/2020:rain_ice_fast_rg/s.f90,Bypass PGI/NVHPC OPENACC BUG data partially present => enter data in ini_rain_ce & DO CONCURRENT

Juan 11/08/2020: rain_ice_fast_rg/s.f90 , Bypass PGI/NVHPC OPENACC BUG, error 700: Illegal address during kernel execution => DO CONCURRENT

Remarks: compilation OK, execution not yet functional

The only remaining declare are in the modd_* declarations

Philippe 23/10/2019: OpenACC: rename _OPENACC key to MNH_OPENACC (_OPENACC is a standard OpenACC macro)

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

Philippe 03/10/2019: OpenACC: replace 'declare present' by 'data present' directives for assumed-size dummy arrays (to be standard compliant)

Philippe 20/06/2019: OpenACC: new implementation of OpenACC directives for rain_ice (not yet optimised)

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