Allow page_cache_fastpath to be set on or off for an entire site

We run a highly site with dynamic page content and don't desire entire pages to be cached, but we wanted to use this module to hook drupal into memcache.

So this patch allows you to optionally disable page_cache_fastpath in the settings.php file.
e.g:

$conf['page_cache_fastpath'] = FALSE;

The default behaviour is still to have it enabled.

This patch was developed by IDG Australia