Philippe 09/12/2016: re-added #ifndef MNH_SP4 to prevent problems when compiling on Blue Gene/Q with -qautodbl=4

(cherry picked from commit 9746cd3e)

(cherry picked from commit 7a1e8bc2)

Revert "Christine 25/11/2016 : Correction on the flag for Strang splitting to insure reproducibility between START and RESTA"

This reverts commit d4b7d37a.

Christine 25/11/2016 : Correction on the flag for Strang splitting to insure reproducibility between START and RESTA

(cherry picked from commit 532f44d0)

(cherry picked from commit c3ec51f7)

(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

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

This reverts commit d40b050a.

Conflicts:
	src/SURFEX/readwrite_emis_fieldn.F90