Update SPPM converting all the tla stuff to git stuff

Update SPPM converting all the tla stuff to git stuff

This gives the SPPM the once over to cover all the stuff that changes
because we now use git.

	* info/sppm.texi (Patches): Rewrite for git
	  (Publicly Accessible Repo): New node.
	  (Private Repo): New node.
	  (Making Releases): Rewrite for git.
	  (Version Control): Rewrite for git.

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