PKG-Related tweaks / improvements

PKG-Related tweaks / improvements

Just a couple of small changes related to packaging.  The index file
has been renamed (it isn't signed so giving it a 'gpg' extension was
just silly). Also, the FTP site hasn't existed for years so removed
that from the list of download sites.

	* etc/Makefile.am (dist_etc_DATA): 'package-index.LATEST.gpg' ->
	'package-index'

	* lisp/package-get.el (package-get-base-filename): Rename to
	'package-index'
	(package-get-download-sites): Comment out the FTP site.

	* etc/package-index.LATEST.gpg: Removed.

	* etc/package-index: New.  Replaces above.

Signed-off-by: Steve Youngs <steve@sxemacs.org>