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)

Philippe 04/04/2017: OpenACC: replaced declare create by data enter create (workaround for PGI bug on OpenPOWER)

* use data zones instead of data create (to prevent crashes on OpenPOWER
  with PGI up to 17.3)
* use atomic and force loop parallelisation for COUNTJVxD_DEVICE subroutines
* force parallelisation of some loops that were not automatically parallelised
* added NOKRR7 define key to remove optional argument part of the code
  of OpenACC kernels (to prevent crashes on OpenPOWER)

Philippe 27/02/2017: OpenACC: work on rain_ice.f90 (1st version with kernels everywhere for Hector testcase))

(cherry picked from commit cd3cb1ce)

Philippe 26/01/2017: OpenACC: replaced mirror directives by declare (bug preventing this with PGI compiler no longer present in version 16.10)

Philippe 19/01/2017: OpenACC: added warnings for not yet tested/implemented subroutines (since sync with 5.3.0)

Philippe 19/01/2017: OpenACC: gradient + shuman: ported modifications to device versions of subroutines

=> compute correctly Hector testcase on NVIDIA (WENO 3)

WARNING: this version does compile but results are not yet correct

Merge branch 'MNH-53-branch' of mesonh2.aero.obs-mip.fr:/gitrepos/MNH-git_open_source-lfs into MNH-53-branch

Juan 12/12/2016: job_make_examples_CRAY_cca,job_make_mesonh_CRAY_cca , switch to default ifort compiler

Juan 12/12/2016: Rules.LXcray.mk , for problem with *.mod generation, add -em -ef for cdf/grib_api lib creation

Juan 12/12/2016: configure, for ECMWF , switch by default to new ifort compiler, old cray cdt/1.15_8.2.7 in 2nd choose