* added LVERB_OUTLST, LVERB_STDOUT, LVERB_ALLPRC in NAM_CONFIO namelist
* added TFILE_OUTPUTLISTING pointer to select file for output of PRINT_MSG

* added OUTPUTLISTING CTYPE for files (IO_FILE_OPEN_ll and IO_FILE_ADD2LIST)
* added NLU variable in TFILEDATA datatype
* removed HFIPRI argument in IO_FILE_OPEN_ll, FMOPEN_ll, IO_FILE_CLOSE_ll
  and FMCLOS_ll subroutines
* removed FM_ERR subroutine
* KRESP return code is now optional for IO_FILE_OPEN_ll, FMOPEN_ll,
  IO_FILE_CLOSE_ll and FMCLOS_ll subroutines

Philippe 03/10/2017: set IP and NPROC in INIT_NMNH_COMM_WORLD + removed superfluous MPI initialisation in PREP_NEST_PGD

* removed TRANSFR and TRANSFW subroutines (dangerous and not respecting
  array profiles and types)
* replaced by intrinsic TRANSFER (Fortran 90)

* added IO_READ_FIELD_BYNAME_X4/X5/X6 and IO_READ_FIELD_BYFIELD_X4/X5/X6
  subroutines to IO_READ_FIELD procedure
* added IO_READ_FIELD_LFI_X4/X5/X6 subroutines to IO_READ_FIELD_LFI procedure
* added IO_READ_FIELD_NC4_X4/X5/X6 subroutines to IO_READ_FIELD_NC4 procedure

* CINIFILE/CINIFILEPGD: default values now set in modd_lunitn
* CLUOUT and COUTFILE: initialised in modd_lunitn
* simplified some manipulations of CINIFILE

Warning: not fully tested

+ removed some LEN=LEN_HREC for unrelated variables

+ removed unused variables

It was already possible but LEN_HREC was missing in some places.

Done to prevent problems later

* added IO_READ_FIELD_BYNAME_N1 and IO_READ_FIELD_BYFIELD_N1 subroutines
  to IO_READ_FIELD procedure
* added IO_READ_FIELD_LFI_N1 subroutine to IO_READ_FIELD_LFI procedure
* added IO_READ_FIELD_NC4_N1 subroutine to IO_READ_FIELD_NC4 procedure

Philippe 18/08/2017: IO: use IO_READ_FIELD for several fields, IO_FILE_OPEN and IO_FILE_CLOSE for several files

Philippe 18/08/2017: IO: IO_FILE_ADD2LIST manage the case in which a file is already in the filelist (with an optional argument)

Philippe 18/08/2017: IO: added NOPEN_CURRENT to TFILEDATA type to allow multiple concurrent openings of a given file

Philippe 18/08/2017: IO: IO_READ_FIELD read fields even if CFORMAT=LFICDF4 (and therefore file opened in WRITE mode)

* added IO_READ_FIELD_BYNAME_N2/L1 and IO_READ_FIELD_BYFIELD_N2/L1 subroutines
  to IO_READ_FIELD procedure
* added IO_READ_FIELD_LFI_N2/L1 subroutines to IO_READ_FIELD_LFI procedure
* added IO_READ_FIELD_NC4_N2/L1 subroutines to IO_READ_FIELD_NC4 procedure

Warning: there is a netCDF/HDF5 bug (HDF5/1.8.9 and netCDF/4.1.3)
Works with HDF5/1.8.19, netCDF-C/4.4.1.1 and netCDF-fortran/4.4.4

* added IO_READ_FIELD_BYNAME_X3 and IO_READ_FIELD_BYFIELD_X3 subroutines
  to IO_READ_FIELD procedure
* added IO_READ_FIELD_LFI_X3 subroutine to IO_READ_FIELD_LFI procedure
* added IO_READ_FIELD_NC4_X3 subroutine to IO_READ_FIELD_NC4 procedure
* check all dimensions instead of total size when reading a field
  in netCDF files

* added IO_FILE_ADD2LIST subroutine and use it
* IO_FILE_OPEN now requires the file to be in the file list
* IO_FILE_FIND_BYNAME: added optional argument useful when checking
  that a file does not yet exist
  + bug correction when filelist is empty
* added IO_FILE_PRINT_LIST subroutine (only for debugging)
* added TPTR2FILE structure to allow construction of arrays of
  pointers to files
* use IO_READ_FIELD for some 3D float arrays (in read_field.f90)
* OPEN_ll: added UPDATE_METADATA internal subroutines to treat file metadata