Philippe 20/02/2018: SURFEX: add special treatment if KP is zero size (to prevent problems with XLF)

Philippe 16/02/2018: SURFEX: bug correction: allocate some work arrays to 0,1,1 instead of 0,0,1 (crash with XLF)

Philippe 13/02/2018: re-added #ifndef MNH_SP4 to prevent problems when compiling on Blue Gene/Q with -qautodbl=4

* always set MNH_REAL (8 by default)
* MNH_REAL has to be set to 4 or 8 (and not R4 or R8)
* XYZ is slightly modified to contain ...-ARCH-RxIy-...
* pass MNH_REAL to pre-processing
* replace MNH_REALS by MNH_REAL

* corrected intent in READ_ALL_DATA_GRIB_CASE
* workaround for compiler bug (Intel 2013.1) in IO_WRITE_HEADER
* use own NetCDF (bug in default version of Ada (4.1.3))

Philippe 09/03/2018: IO/LFI: add NFILENAMELGTMAXLFI parameter and use it to force size in LFI file of MY_NAME and DAD_NAME
This is done for backward compatibility.

If truncated with TRIM/LEN_TRIM => problems with conv2dia

Philippe 06/02/2018: IO: modify NGRID for several fields (to remove problems with PARIS_GARDEN testcase)

Philippe 29/01/2018: FIND_FIELD_ID_FROM_MNHNAME: add optional argument ONOWARNING to remove warning messages when they are normal (debug level)

 Conflicts:
	src/MNH/diag.f90