* autogen.sh (do_autoconf, do_git): New vars.
Support new arguments --help, all, autoconf, git.
By default, just do autoconf-related configuration, not git.
Prefer 'echo' to 'cat <<EOF ...', as this tends to avoid temp files.
If GNU cp is available, use it to backup .git/config before
changing it. When configuring git, chatter about what is being
done, and configure git to check hashes. Avoid some duplicate
file name specification when creating git hooks.
* GNUmakefile (ALL_IF_GIT): New macro.
(configure): Use it.
* INSTALL.REPO: Suggest './autogen.sh all'.
(ORDINARY_GOALS): New macro, which excludes 'bootstrap'.
(bootstrap, .PHONY): New rules.
* INSTALL.REPO: Document current procedure better.
Move copyright notice to just before license notice.
Ref: http://lists.gnu.org/archive/html/emacs-devel/2013-10/msg00806.html
* autogen: Remove directory. Move update_autogen to admin/.
* autogen.sh: Remove reference to copy_autogen.
* GNUmakefile (configure):
* Makefile.in (bootstrap): Do not try to run copy_autogen.
* config.bat: Use msdos/autogen rather than autogen.
* admin/update_autogen: Move here from ../autogen.
(usage): Update. Remove -l, add -A.
(autogendir): New variable.
(ldefs_flag): Default to set.
(genfiles): Reduce to only ms-dos relevant files.
(main): Make checking autogen sources optional.
Make copying of autogen files optional.
* msdos/autogen/config.in:
* msdos/autogen/Makefile.in: Move here from ../autogen.
* nt/INSTALL: Remove reference to copy_autogen.
* nt/config.nt: Comment.
