* autoheader.sh: s/-eq/=/.
Uniform ordering of variable initializations, option handling.
Don't use quotes where useless (foo=$1, not foo="$1").
Propagate `run_m4' and `run_m4f'.
Use `$0' in --help.
* autoconf.sh: Likewise.
* autoreconf.sh: Likewise.
* autoupdate.sh: Likewise.
* ifnames.sh: Likewise.
* autoupdate.m4: Small bug: at the end `dnl' is disabled, so use
`m4_dnl'.
given in the prologue of acobsolete.m4.
* acgeneral.m4 (Prologue): Enter the `autoconf' name space.
(AU_DEFUN): New macro.
* autoupdate.m4: New file.
Disable the name spaces `autoconf', and `libm4'. Disable libm4.
* Makefile.am: Tuned to support the changes above.
* autoupdate.sh: Model after autoconf.sh.
Can run on several files at once (for instance m4/*.m4).
Don't touch files that are up to date.
Run m4 on autoupdate.m4f instead of playing with sed.
Use AU_DEFUN.
* acgeneral.m4 (AC_LINK_FILES, AC_ENABLE, AC_WITH): Use AU_DEFUN,
remove the call to AC_OBSOLETE.
* acspecific.m4 (AC_CYGWIN32): Likewise.
* acoldnames.m4: Replaced all the definitions via `define' or
`AC_DEFUN' to use `AU_DEFUN'.
