tar: quote 'like this', not `like this'

This fixes some test failures recently introduced by gnulib updates
prompted by recent changes to the GNU coding standards,
which now advise to use quotes 'like this' or "like this"
rather than `like this'.
* NEWS: Document this.
* README, README-hacking, doc/Makefile.am, scripts/backup.in:
* scripts/backup.sh.in, scripts/dump-remind.in:
* src/buffer.c, src/checkpoint.c, src/create.c, src/incremen.c:
* src/misc.c, src/names.c, src/sparse.c, src/transform.c:
* tests/incr02.at, tests/incremental.at, tests/multiv08.at:
* tests/sparse04.at, tests/star/README, tests/update01.at:
Quote 'like this' in comments.
* src/tar.h:
Quote "like this" in comments, when quoting English phrases rather
than code.
* configure.ac:
* scripts/xsparse.c (get_var, read_xheader, main):
* src/compare.c (diff_archive):
* src/extract.c (prepare_to_extract):
* src/tar.c (request_stdin, tar_set_quoting_style, doc, options)
(set_subcommand_option, report_textual_dates, parse_opt)
(decode_options, main):
* src/xheader.c (decx):
Quote 'like this' in diagnostics.
* doc/tar.texi (list, warnings, override)
(Selecting Archive Members, quoting styles, after, hard links)
(Sparse Recovery, Multi-Volume Archives, label):
Adjust documentation to match new output.
* tests/backup01.at, tests/incr01.at, tests/incr04.at:
* tests/label04.at, tests/label05.at, tests/link03.at:
* tests/listed02.at, tests/multiv03.at, tests/multiv05.at:
* tests/rename01.at, tests/rename02.at, tests/rename03.at:
* tests/volume.at:
Adjust tests to match new quoting behavior.

1 files changed, 5 insertions, 5 deletions

diff --git a/src/buffer.c b/src/buffer.c
index e52b1b10..4a980b5d 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -103,7 +103,7 @@ bool write_archive_to_stdout;
 
 /* Multi-volume tracking support */
 
-/* When creating a multi-volume archive, each `bufmap' represents
+/* When creating a multi-volume archive, each 'bufmap' represents
    a member stored (perhaps partly) in the current record buffer.
    After flushing the record to the output media, all bufmaps that
    represent fully written members are removed from the list, then
@@ -337,23 +337,23 @@ const char *
 first_decompress_program (int *pstate)
 {
   struct zip_program const *zp;
-  
+
   if (use_compress_program_option)
     return use_compress_program_option;
 
   if (archive_compression_type == ct_none)
     return NULL;
 
-  *pstate = 0; 
+  *pstate = 0;
   zp = find_zip_program (archive_compression_type, pstate);
   return zp ? zp->program : NULL;
 }
-    
+
 const char *
 next_decompress_program (int *pstate)
 {
   struct zip_program const *zp;
-  
+
   if (use_compress_program_option)
     return NULL;
   zp = find_zip_program (archive_compression_type, pstate);