* mode_device: add GET_FROM_DEVICE1D_INT subroutine
* mode_mppdb: add MPPDB_CHECK1D_INT subroutine

(cherry picked from commit 3c3739cb)

Philippe 25/07/2018: OPenACC: corrections + implementation to get correct results for HECTOR testcase

* mode_device: add GET_FROM_DEVICE1D_LOG, GET_FROM_DEVICE1D_REAL and GET_FROM_DEVICE3D_LOG subroutines
* mode_gather: add GATHERALL_L3, GATHERXX_L3 and GATHERXY_L3 subroutines
* mode_mppdb: add MPPDB_CHECK1D_LOG, MPPDB_CHECK1D and MPPDB_CHECK3D_LOG

Philippe 04/07/2018: SURFEX: bug correction: PLMO must be declared POINTER because it can be passed non associated

(cherry picked from commit 7be76db3)

Philippe 28/06/2018: IO: if a file is not found in the requested fileformat, try the other one (LFI or NetCDF)

Philippe 27/06/2018: OpenACC: small modifications to allow compilation with PGI (runs probably not yet OK)

(cherry picked from commit 3580a7c0)

* R4 are now written in netCDF files as simple precision
* files can be read even if written with different integer or real precisions
* new attributes for netCDF files: MNH_REAL and MNH_INT
* several small bug corrected