* vol2.texi (Top): Update.

	* vol2.texi (Top): Update.
	* vol1.texi (Top): Update.
	* tips.texi (Library Headers): Mention Package-Version and
	Package-Requires.
	* package.texi: New file.
	* os.texi (System Interface): Update pointers.
	* elisp.texi (Top): Link to new nodes.  Include package.texi.
	* anti.texi (Antinews): Update pointers.