move non-member octave_value operator functions to octave namespace * ov.h, ov.cc (unary_op, binary_op, cat_op, colon_op): New functions in octave namespace that replace do_unary_op, do_binary_op, do_cat_op, and do_colon_op, respectively. (do_unary_op, do_binary_op, do_cat_op, do_colon_op): Deprecate global functions. Forward to corresponding new functions in octave namespace. * bsxfun.cc, cellfun.cc, data.cc, dot.cc, fft.cc, oct-stream.cc, stack-frame.h, tril.cc, ov-base-diag.cc, ov-bool.cc, ov-class.cc, ov-complex.cc, ov-float.cc, ov-flt-complex.cc, ov-intx.h, ov-lazy-idx.h, ov-magic-int.cc, ov-perm.cc, ov-range.cc, ov-scalar.cc, oct-lvalue.cc, oct-lvalue.h, pt-binop.cc, pt-cbinop.cc, pt-colon.cc, pt-eval.cc, pt-tm-const.cc, pt-unop.cc: Change all uses.

--- a/libinterp/parse-tree/pt-eval.cc	Thu Jul 30 16:15:03 2020 -0400
+++ b/libinterp/parse-tree/pt-eval.cc	Thu Jul 30 16:16:04 2020 -0400
@@ -2606,9 +2606,9 @@
                 if (m_echo_state)
                   m_echo_file_pos = line;
 
-                // do_index_op expects one-based indices.
+                // index_op expects one-based indices.
                 idx(iidx) = i;
-                octave_value val = arg.do_index_op (idx);
+                octave_value val = arg.index_op (idx);
 
                 ult.assign (octave_value::op_asn_eq, val);