Adapt start.php to multisite caches

[fabcol]

engine/start.php should be adapted to implement different caches depending on the site_guid on the site you are currently running

this is my code :

(should be set after the boot, system to be abble to get a site_guid value)

// needs to be set for links in html head
//Multisite add site_guid to datalist variables
$id=$CONFIG->site->guid;

$viewtype = get_input('view', 'default');
$lastcached = datalist_get("simplecache_lastcached_".$id."_".$viewtype);
$CONFIG->lastcache = $lastcached;

// Regenerate the simple cache if expired.
// Don't do it on upgrade because upgrade does it itself.
// @todo - move into function and perhaps run off init system event

if (!defined('UPGRADING')) {
	$lastupdate = datalist_get("simplecache_lastupdate_".$id."_".$viewtype);
	$lastcached = datalist_get("simplecache_lastcached_".$id."_".$viewtype);
	if ($lastupdate == 0 || $lastcached < $lastupdate) {
		elgg_regenerate_simplecache($viewtype);
		$lastcached = datalist_get("simplecache_lastcached_".$id."_".$viewtype);
	}
	$CONFIG->lastcache = $lastcached;

[ewinslow]

I'm not really clear on what our multisite plan is, to be honest.