Split the script installation/configuration into separate methods covering each
kind of script.
Tidied up site-packages references.
1 Site directory detection.
2 Enabled/available site listings.
3 HTTP user integration and Apache user/group file editing.
4 Support Xapian search.
5 Support OpenID and other authentication methods.
6 Remember anonymous_session_lifetime for 1.8.x and cookie_lifetime for 1.9.x.