change ad_verify_and_get_user_id to ad_conn user_id, change ad_maybe_redirect_for_registration to auth::require_login, make some db_ and dt_ function -public
Patch #139: A bunch of fixes and nitpicks to improve the subsite awareness of the acs-subsite package, and improve support for ad_context_bar. Note that fixes needed in acs-subsite/www/admin and /permissions are not included, and that there is still quite a bit of I18N work to be done in acs-subsite.