In fact, rename this option as -A, --autoconf-dir.
* autoconf.sh: Complain when -m, --macrodir is used.
Accept -A, --autoconf-dir.
Use $autoconf_dir instead of $AC_MACRODIR.
Adjust --help.
* autoheader.sh: Likewise.
* autoscan.sh: Likewise.
* autoupdate.sh: Likewise.
Use $optarg.
* autoreconf.sh: Likewise.
* doc/autoconf.texi: Adjust.
* tests: Adjust the test suite.
Use `#' to denote Autoconf comments, not `dnl'.
Put a few `' here and there to avoid misfontification and
misindentation.
Use your base name when reporting errors.
(parse_args::usage): Use $0, use the same order as the other
executables.
(parse_args): Don't dump `--help' on cmd line errors.
Fix the --version of all the executables.
* Makefile.am (editsh, editpl): Substitute also PACKAGE and
VERSION.
* autoconf.sh (version): New string.
(--version): Use it.
(--help) Output on stdout, not stderr.
* autoheader.sh: Likewise.
* autoreconf.sh: Likewise.
* autoscan.pl: Likewise.
* autoupdate.sh: Likewise.
* ifnames.sh: Likewise.