* 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