Philippe 09/06/2017: IO: name of the variable added to the name of the written field and better comment (true comment + units)

This was a bug for FIELDLIST_GOTO_MODEL (LCARTESIAN not always known when called).
This is necessary for INI_FIELD_LIST to allow it to be called before reading data files.

* added IO_WRITE_FIELD_LFI_L0 and IO_WRITE_FIELD_LFI_L1 subroutines
  to IO_WRITE_FIELD_LFI procedure
* added IO_WRITE_FIELD_NC4_L0 and IO_WRITE_FIELD_NC4_L1 subroutines
  to IO_WRITE_FIELD_NC4 procedure
* modified IO_WRITE_FIELD_BYFIELD_L0 and IO_WRITE_FIELD_BYFIELD_L1
  subroutines (do not convert logical to integers any more)
* added ALLOCBUFFER_L1 subroutine to ALLOCBUFFER_ll procedure
* added GATHERXX_L1 subroutine to GATHER_XXFIELD procedure

+ preparation for other types (not yet available in TFIELDLIST)

* added IO_WRITE_FIELD_BYNAME_X6 and IO_WRITE_FIELD_BYFIELD_X6 subroutines
  to IO_WRITE_FIELD procedure
* added IO_WRITE_FIELD_LFI_X6 subroutine to IO_WRITE_FIELD_LFI procedure
* added IO_WRITE_FIELD_NC4_X6 subroutine to IO_WRITE_FIELD_NC4 procedure

Warning: not tested

Philippe 05/05/2017: bug correction: removed IF based on variables that could be different on different meshes

+ write the header for PREP_REAL_CASE and SPAWNING

* added IO_WRITE_FIELD_BYNAME_N3 and IO_WRITE_FIELD_BYFIELD_N3 subroutines
  to IO_WRITE_FIELD procedure
* added IO_WRITE_FIELD_LFI_N3 subroutine to IO_WRITE_FIELD_LFI procedure
* added IO_WRITE_FIELD_NC4_N3 subroutine to IO_WRITE_FIELD_NC4 procedure
* possible to write 3D integer values in output files
* added ALLOCBUFFER_N3 to ALLOCBUFFER_ll procedure
* added GATHERXX_N3 to GATHER_XXFIELD procedure
* added GATHERXY_N3 to GATHER_XYFIELD procedure

Philippe 25/04/2017: IO: modified SET_CONFIO_ll to help prevent confusion in variable names from 2 modules + bug correction

Philippe 25/04/2017: bug correction: allocate xxx_MAX arrays if LMEAN_FIELD + initialize them to lowest possible value

(cherry picked from commit 2528125a)

Philippe 25/04/2017: bug correction: allocate xxx_MAX arrays if LMEAN_FIELD + initialize them to lowest possible value

(cherry picked from commit 2528125a)

Philippe 25/04/2017: bug correction: allocate xxx_MAX arrays if LMEAN_FIELD + initialize them to lowest possible value

Warning: not tested (especially on ZOOM_PGD which is not supported anymore)

* use new structures of files and fields for PREP_SURFEX
* bug correction when writing empty DAD_NAME
* adapt WRITE_SURFT0_MNH to new structures

(cherry picked from commit f7d3e2df)

* removed CDADFILENAME field from TOUTBAK structure
* added TDADFILE field to TFILEDATA structure

Philippe 11/04/2017: IO: use IO_WRITE_FIELD (and others) for several fields (chosen from testcase 014_LIMA)

Philippe 11/04/2017: IO: added IO_WRITE_FIELD_BOX interface with IO_WRITE_FIELD_BOX_BYFIELD_X5 subroutine