Philippe 24/112016: lfi2cdf: bug correction: size of buffer was too small when doing cdf2lfi (length of comment was not taken into account)

Philippe 24/11/2016: lfi2cdf: nc4 files have again a .nc4 extension to be consistent with MESONH and the scripts

(cherry picked from commit e387e7c8)

(cherry picked from commit 94c4a2a8)

(cherry picked from commit b6151050)

C.Lac 15/11/2016 : Correction on the flag for Strang splitting to insure reproducibility between START and RESTA

(cherry picked from commit e321c0eb)

Conflicts:
	src/MNH/advection_metsv.f90
	src/MNH/ppm_met.f90
	src/MNH/ppm_scalar.f90

This reverts commit d40b050a.

Conflicts:
	src/SURFEX/readwrite_emis_fieldn.F90

Conflicts:
	src/ARCH_SRC/CPL_WAVE/MNH/ground_paramn.f90
	src/ARCH_SRC/CPL_WAVE/MNH/ini_modeln.f90
	src/MNH/default_desfmn.f90
	src/MNH/goto_model_wrapper.f90
	src/MNH/ground_paramn.f90
	src/MNH/ini_lb.f90
	src/MNH/ini_modeln.f90
	src/MNH/modeln.f90
	src/MNH/read_exsegn.f90
	src/MNH/read_field.f90
	src/MNH/write_aircraft_balloon.f90
	src/SURFEX/ch_init_depconst.F90
	src/SURFEX/ch_init_emissionn.F90
	src/SURFEX/ch_init_snapn.F90
	src/SURFEX/init_surf_atmn.F90
	src/SURFEX/writesurf_snapn.F90

* return is not allowed in main program => stop
* number of variables to be read and written was not computed correctly
* name of the outputfile is now correct
* treat correctly the last variable given with -v option
* correct bugs if LOWMEM is set (variables with length=1, reading of TEXT variables)
* correct types when LFI_INT is 8

Philippe 08/07/2016: it is now possible to compile the bin_tools directly with MESONH using the MNH_TOOLS key.
For the moment, only LFI2CDF is available. The executable are linked to bin_tools/

Philippe 08/07/2016: removed profile_mesonh file (automatically generated from profile_mesonh.ihm at configure)

Philippe 17/06/2016: optimisations: removed unnecessary operations when JSPL=K/ISPLIT, removed unnecessary initialisations

Philippe 17/06/2016: optimisation: change variable status INOUT->OUT, replace update by affectation, removed intermediate variable