bin/autoupdate.in, bin/ifnames.in, lib/Autom4te/General.pm,
lib/Autom4te/Struct.pm, lib/Autom4te/XFile.pm: Add local variables
so that Emacs setups GNU style for perl-mode and cperl-mode.
unchanged, remove the source.
(&up_to_date_p): Don't be verbose, be debug.
* bin/autoreconf.in: No longer support --m4dir.
(&autoreconf): Display the full path of the configure.ac we are
studying.
Trace it only once.
Be sure to honor --force with gettextize.
Always run aclocal.
* doc/autoconf.texi: Adjust.