heavily accessed site like appdb. This change solves the mystery of why we had millions of unexpired sessions
in session_list and should make the session_list cron cleanup job superfluous.
- php_value short_open_tag 0 (disable shorttags so that we can use <?xml in the future)
- php_value session.bug_compat_42 0 (session works well without the workaround so let's disable it)
- php_value register_long_arrays 0 (we are not using the old long arrays ($HTTP_SESSION_VARS and so on)
