Convert the tla-generated versioning info to git-generated

Convert the tla-generated versioning info to git-generated

	This changeset converts all of our sexy automagic versioning info
	from being tla-based to being git-based.  The old tla variables
	are now gone, replaced with git equivalents...

	    SXEMACS_ARCH_VERSION -> SXEMACS_GIT_VERSION
	    sxemacs_arch_version -> sxemacs_git_version
	    sxemacs-arch-version -> sxemacs-git-version
	    SXEMACS_MAIN_ARCH_VERSION -> removed.

	Also, a .gitignore has been added to the repo.

	* src/emacs.c (vars_of_emacs): New variable, Vsxemacs_git_version,
	sxemacs-git-version

	* m4/sxe-summary.m4: tla -> git

	* lisp/version.el (emacs-version): Use sxemacs-git-version instead
	of the old arch one.

	* lisp/obsolete.el (sxemacs-arch-version): Obsolete it.

	* lisp/build-rpt.el (build-rpt-subject): Use SXEMACS_GIT_VERSION
	instead of the old arch one.

	* configure.ac: tla -> git

	* autogen.sh: Convert all the tla/arch stuff to git stuff.

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