use ' instead of ` in error messages, warnings and most comments * intro.txi, io.txi, munge-texi.cc, octave.texi, cmd-edit.cc, data-conv.cc, file-ops.cc, glob-match.h, kpse.cc, oct-env.cc, oct-locbuf.h, oct-md5.cc, oct-rand.cc, general/interp2.m, doc.m, get_first_help_sentence.m, help.m, print_usage.m, __additional_help_message__.m, type.m, unimplemented.m, which.m, cast.m, dir.m, license.m, mkoctfile.m, recycle.m, tempdir.m, optimset.m, pkg/pkg.m, closereq.m, colstyle.m, __fltk_print__.m, __gnuplot_print__.m, __go_draw_figure__.m, __pie__.m, __pltopt__.m, __print_parse_opts__.m, uigetdir.m, uigetfile.m, uiputfile.m, stft.m, mean.m, anova.m, cor_test.m, t_test_regression.m, __magick_read__.cc, dlmread.cc, schur.cc, data.cc, debug.cc, defun-dld.h, defun.cc, defun.h, dynamic-ld.cc, error.cc, error.h, gl-render.cc, graphics.cc, gripes.cc, input.cc, lex.ll, load-path.cc, load-save.cc, ls-hdf5.cc, ls-mat-ascii.cc, ls-mat4.cc, ls-mat5.cc, ls-oct-ascii.cc, ls-oct-binary.cc, oct-hist.cc, oct-parse.yy, oct-stream.cc, oct-stream.h, octave.cc, ov-base-diag.cc, ov-base.cc, ov-class.cc, ov-colon.h, ov-struct.cc, ov-typeinfo.cc, ov.cc, pager.cc, pr-output.cc, pt-binop.cc, pt-eval.cc, pt-id.cc, pt-idx.cc, pt-misc.cc, pt-unop.cc, symtab.cc, symtab.h, toplev.cc, txt-eng-ft.cc, utils.cc, variables.cc, test_eval-catch.m, test_try.m: Use ' instead of ` in error messages, warnings, and most comments.

--- a/src/oct-stream.h
+++ b/src/oct-stream.h
@@ -87,14 +87,14 @@
   // TRUE if we are not storing the result of this conversion.
   bool discard;
 
-  // Type of conversion -- `d', `i', `o', `u', `x', `e', `f', `g',
-  // `c', `s', `p', `%', or `['.
+  // Type of conversion -- 'd', 'i', 'o', 'u', 'x', 'e', 'f', 'g',
+  // 'c', 's', 'p', '%', or '['.
   char type;
 
-  // A length modifier -- `h', `l', or `L'.
+  // A length modifier -- 'h', 'l', or 'L'.
   char modifier;
 
-  // The class of characters in a `[' format.
+  // The class of characters in a '[' format.
   std::string char_class;
 };
 
@@ -229,14 +229,14 @@
   // Precision.
   int prec;
 
-  // Flags -- `-', `+', ` ', `0', or `#'.
+  // Flags -- '-', '+', ' ', '0', or '#'.
   std::string flags;
 
-  // Type of conversion -- `d', `i', `o', `x', `X', `u', `c', `s',
-  // `f', `e', `E', `g', `G', `p', or `%'
+  // Type of conversion -- 'd', 'i', 'o', 'x', 'X', 'u', 'c', 's',
+  // 'f', 'e', 'E', 'g', 'G', 'p', or '%'
   char type;
 
-  // A length modifier -- `h', `l', or `L'.
+  // A length modifier -- 'h', 'l', or 'L'.
   char modifier;
 };