%N wrhdl %F $MIR/src/subs/headio.c
%D Write an integer*8 valued header variable.
%P pjt
%: header-i/o
%B
FORTRAN call sequence:
        subroutine wrhdl(tno,keyword,value)
        integer tno
        character keyword*(*)
        integer*8 value

  Write an integer*8 valued header variable. This is only supported
  on compilers that know how to handle integer*8 (e.g. gnu, intel).
  Without this support, some files in miriad will be limited to
  8 GB.

  Input:
    tno         The handle of the data set.
    keyword     The name of the header variable.
    value       The integer*8 value of the header variable.             
