maint: New method rwdata() as clearer alternative to fortran_vec(). * etc/NEWS.10.md: Announce new method and recommend its use in future code. * doc/interpreter/external.txi: Update Octave manual to use rwdata. * liboctave/array/Array.h (rwdata): New function prototype. * liboctave/array/Array.h (fortran_vec): Make inline function that calls rwdata(). * liboctave/array/DiagArray2.h (rwdata): New function prototype. * liboctave/array/DiagArray2.h (fortran_vec): Make inline function that calls rwdata(). * examples/code/fortrandemo.cc, libgui/graphics/QtHandlesUtils.cc, libinterp/corefcn/Cell.cc, libinterp/corefcn/__dsearchn__.cc, libinterp/corefcn/__ichol__.cc, libinterp/corefcn/__ilu__.cc, libinterp/corefcn/__lin_interpn__.cc, libinterp/corefcn/__magick_read__.cc, libinterp/corefcn/__pchip_deriv__.cc, libinterp/corefcn/amd.cc, libinterp/corefcn/data.cc, libinterp/corefcn/dot.cc, libinterp/corefcn/ellipj.cc, libinterp/corefcn/filter.cc, libinterp/corefcn/gcd.cc, libinterp/corefcn/gl-render.cc, libinterp/corefcn/graphics.cc, libinterp/corefcn/graphics.in.h, libinterp/corefcn/kron.cc, libinterp/corefcn/ls-mat4.cc, libinterp/corefcn/ls-mat5.cc, libinterp/corefcn/mex.cc, libinterp/corefcn/oct-map.cc, libinterp/corefcn/oct-stream.cc, libinterp/corefcn/ordqz.cc, libinterp/corefcn/ordschur.cc, libinterp/corefcn/perms.cc, libinterp/corefcn/psi.cc, libinterp/corefcn/quadcc.cc, libinterp/corefcn/qz.cc, libinterp/corefcn/rand.cc, libinterp/corefcn/sqrtm.cc, libinterp/corefcn/strfind.cc, libinterp/corefcn/symrcm.cc, libinterp/corefcn/tril.cc, libinterp/corefcn/typecast.cc, libinterp/corefcn/xdiv.cc, libinterp/dldfcn/__delaunayn__.cc, libinterp/dldfcn/__glpk__.cc, libinterp/dldfcn/__ode15__.cc, libinterp/dldfcn/__voronoi__.cc, libinterp/dldfcn/audioread.cc, libinterp/dldfcn/convhulln.cc, libinterp/octave-value/ov-base-int.cc, libinterp/octave-value/ov-bool-mat.cc, libinterp/octave-value/ov-ch-mat.cc, libinterp/octave-value/ov-cx-diag.cc, libinterp/octave-value/ov-cx-mat.cc, libinterp/octave-value/ov-flt-cx-diag.cc, libinterp/octave-value/ov-flt-cx-mat.cc, libinterp/octave-value/ov-flt-re-diag.cc, libinterp/octave-value/ov-flt-re-mat.cc, libinterp/octave-value/ov-intx.h, libinterp/octave-value/ov-java.cc, libinterp/octave-value/ov-perm.cc, libinterp/octave-value/ov-re-diag.cc, libinterp/octave-value/ov-re-mat.cc, libinterp/octave-value/ov-str-mat.cc, liboctave/array/Array-base.cc, liboctave/array/Array-util.cc, liboctave/array/CColVector.cc, liboctave/array/CDiagMatrix.cc, liboctave/array/CMatrix.cc, liboctave/array/CNDArray.cc, liboctave/array/CRowVector.cc, liboctave/array/CSparse.cc, liboctave/array/DiagArray2.h, liboctave/array/MArray.cc, liboctave/array/PermMatrix.cc, liboctave/array/Range.h, liboctave/array/Sparse.cc, liboctave/array/boolSparse.cc, liboctave/array/dColVector.cc, liboctave/array/dDiagMatrix.cc, liboctave/array/dMatrix.cc, liboctave/array/dNDArray.cc, liboctave/array/dRowVector.cc, liboctave/array/dSparse.cc, liboctave/array/fCColVector.cc, liboctave/array/fCDiagMatrix.cc, liboctave/array/fCMatrix.cc, liboctave/array/fCNDArray.cc, liboctave/array/fCRowVector.cc, liboctave/array/fColVector.cc, liboctave/array/fMatrix.cc, liboctave/array/fNDArray.cc, liboctave/array/fRowVector.cc, liboctave/array/idx-vector.cc, liboctave/numeric/CollocWt.cc, liboctave/numeric/DASPK.cc, liboctave/numeric/DASRT.cc, liboctave/numeric/DASSL.cc, liboctave/numeric/EIG.cc, liboctave/numeric/LSODE.cc, liboctave/numeric/Quad.cc, liboctave/numeric/aepbalance.cc, liboctave/numeric/bsxfun-defs.cc, liboctave/numeric/chol.cc, liboctave/numeric/eigs-base.cc, liboctave/numeric/fEIG.cc, liboctave/numeric/gepbalance.cc, liboctave/numeric/gsvd.cc, liboctave/numeric/hess.cc, liboctave/numeric/lu.cc, liboctave/numeric/oct-convn.cc, liboctave/numeric/oct-rand.cc, liboctave/numeric/qr.cc, liboctave/numeric/qrp.cc, liboctave/numeric/schur.cc, liboctave/numeric/sparse-dmsolve.cc, liboctave/numeric/sparse-lu.cc, liboctave/numeric/sparse-qr.cc, liboctave/numeric/svd.cc, liboctave/operators/mx-inlines.cc, liboctave/operators/mx-op-defs.h, liboctave/util/oct-base64.cc, liboctave/util/oct-binmap.h, liboctave/util/str-vec.cc: Replace calls to fortran_vec() with calls to rwdata().

--- a/libinterp/corefcn/quadcc.cc	Wed Dec 27 14:29:02 2023 -0800
+++ b/libinterp/corefcn/quadcc.cc	Wed Dec 27 16:55:14 2023 -0800
@@ -1672,7 +1672,7 @@
     {
       // Intervals around singularities.
       NDArray arr = args(4).array_value ();
-      sing = arr.fortran_vec ();
+      sing = arr.rwdata ();
       iivals[0] = a;
       std::copy_n (sing, nivals-1, iivals+1);
       iivals[nivals] = b;