Return logical status variable from file functions for Matlab compatibility. * NEWS: Announce change. * dirfns.cc (Frmdir): Update documentation. Change return status to true/false rather than 1.0/0.0. * copyfile.m: Update documentation. Change internal variable "sts" to logical variable. Change any assignments to status to true/false. * movefile.m: Update documentation. Change internal variable "sts" to logical variable. Change any assignments to status to true/false. * mkdir.m: Update documentation. * mkdir.m (mkdir_recur): Change internal variable "status" to logical.

%!function rval = sggval (val)
%!  global gval
%!  if (nargin == 1)
%!    gval = val;
%!  else
%!    rval = gval;
%!  endif
%!endfunction

%!test <*53599>
%! global gval
%! assert (isempty (gval))
%! sggval (13);
%! assert (sggval (), 13);
%! assert (gval, 13);
%! clear global gval
%! assert (sggval (), [])
%! gval = 42;
%! assert (sggval (), []);
%! clear gval
%! global gval
%! gval = 42;
%! assert (sggval (), 42);
%! clear -global gval;  # cleanup after test