Fix the SSIs and remove some obsolescent .htaccess files.

Fix the SSIs and remove some obsolescent .htaccess files.

The '<--#if expr...' magic I was using had stopped working.  This
changeset fixes that.  It also cleans up the .htaccess files (most of
which were rm'd)

	* templates/header.template: Update to use "ap_expr" syntax.

	* .htaccess: Use Apache 2.4.x access control with 'Require'

	* changes/.htaccess: Removed.  It wasn't doing anything that
	wasn't aleady covered in the top-level .htaccess.

	* docs/.htaccess: Ditto.

	* people/.htaccess: Ditto.

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