Quentin 31/03/2020: minor correction : allocate some DUST and SALT coefficient variables only for 1st model, if KMI==1

(cherry picked from commit b584a9ed)

(cherry picked from commit b584a9ed)

This reverts commit bbae8eb8.

This reverts commit d7ac06a0.

Christine 27/11/2019: correction in the drag formula and application to building in addition to tree

Soline Bielli : 01/03/2019: Sea salt update: the significant sea wave height now influences salt emission.
The sea salt is either set to a default value of 2meters or read in ECMWF Grib file (if the variable exists).
Now 5 modes are available (3 before) and the order in output is changed.
The large-scale sea wave height from ECMWF grib is 2D. HALO2 update of the ls variable in modeln is not yet adapted to 2D field (it is switch off in this version for this variable).

Philippe 13/02/2019: remove PPABSM and PTSTEP dummy arguments of READ_FIELD (bugfix: PPABSM was intent(OUT))

* IO_READ_CHECK_FIELD_LFI: reduce error level to warning if unexpected grid for scalar variable
* IO_FILE_OPEN_ll: missing NDIMS for MASDEV
* INI_MODEL_n: associate TINIFILEPGD to TFILE_DUMMY if necessary
* WRITE_BUDGET: set NGRID=1 for 6D MASK variables
* WRITE_DIACHRO: reverted name of field to old behavior (kept improved comment) (patch was lost in previous merge)
* PREPARE_METADATA_WRITE_SURF: keep TPFIELD fieldvalues when in conflict with passed values