Philippe 19/04/2018: IO: add possibility to choose directory for outputs, backups and diachronic files

Philippe 05/04/2018: IO: set all (except if in TFIELDLIST) SURFEX variables to be not time dependent (temporary?)

needed to manage correctly domain number when writing dimension variables

because they are often needed later (and they do not consume a lot of memory)

+ remove temporal_lt function

Philippe 28/03/2018: replace TEMPORAL_DIST by DATETIME_DISTANCE and ADD_FORECAST_TO_DATE and SUBTRACT_TO_DATE by DATETIME_CORRECTDATE

Philippe 22/03/2018: IO: use CFORMAT field of TFILEDATA instead of relying on LIOCDF4, LLFIOUT and LLFIREAD
This prevents some problems when mixing LFI and netCDF files (ie in cdf2lfi)
+ cleaning use of modd_io_ll for LIOCDF4, LLFIOUT and LLFIREAD (and others)

* improvements
* split option works again

* 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.

+ correction for DMFCONV attributes