Update to use gnulib, and newer autoconf, automake conventions.

Update to use gnulib, and newer autoconf, automake conventions.

	Add build-from-checkout instructions.
	* README-hacking: New file.  Mostly copied from coreutils'
	README-cvs.
	* bootstrap: Generate ChangeLog here, if needed/possible,
	before invoking tools that require its presence.
	* autogen.sh: Remove this file.  It's superseded by bootstrap.

	Use gnulib, modernize some uses of autoconf, automake, etc.
	* bootstrap, bootstrap.conf: New files.

	* configure.ac: Modernize.
	Require the latest stable releases: autoconf-2.61, automake-1.10.
	Require gettext-0.15.
	Use more modern form of AC_INIT, etc.
	Now that the version string must be hard-coded in the AC_INIT line,
	add code to ensure it agrees with the PED_* and LT_* variables.
	Use AM_CPPFLAGS, not CFLAGS
	Remove obsolete setting of ALL_LINGUAS.
	Don't set CFLAGS=-D_GNU_SOURCE=1 explicitly , since that's already
	done via AC_GNU_SOURCE, which gnulib pulls in by default,
	through gl_EARLY.
	Use gl_INIT and gl_EARLY.

	* Makefile.am (SUBDIRS): Add lib.
	(EXTRA_DIST): Remove names that are automatically included.
	* lib/Makefile.am: New file.