* improvements
* split option works again

Philippe 19/03/2018: IO: Z-split files: pass also the optional HFORMAT argument (necessary for LFI2CDF)

Philippe 16/03/2018: lfi2cdf: remove file suffix from hinfile and houtfile to manage more cleanly filenames

Philippe 13/02/2018: IO_GUESS_DIMIDS_NC4: manage variables with CLBTYPE/=NONE + add a return value + problems are now WARNING instead of FATAL

* write NF90_INT1 instead of NF90_INT for logicals
* use IO_WRITE_FIELD (not yet done everywhere)
* if NTYPE is unknown => fatal error
* do not try to read JPVEXT (never written)

Philippe 09/03/2018: lfi2cdf: remove redundant fields of workfield (present also in TFIELDDATA) + remove read_data_lfi

Philippe 23/02/2018: lfi2cdf: add CPROGRAM + some initialisations to later use file and fields structures from MNH

(necessary for LFI2CDF)

Philippe 22/02/2018: lfi2cdf: works with more situations (not yet perfect) + nc4 files have a .nc suffix

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)