Philippe 28/03/2022: OpenACC: use MNH_MEM_GET family calls in several subroutines + necessary modifications to keep performance and successful compilation with NVHPC (22.2)

The only remaining declare are in the modd_* declarations

Philippe 21/11/2019: automatic arrays -> allocatable (to work around PGI OpenACC bug) for turbulence+some others

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

Philippe 02/10/2019: OpenACC: remove declare present directives from module declaration sections (to be standard compliant)

Juan (& Philippe) 11/06/2018: new BR_P2 function to compute power of 2 in a bit reproducible way (for PGI on CPU and GPU)