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
Major overhaul: - Replaced CyberCash with Payment Service Contract interface. - Added Shipping Service Contract. - Many(!) bug fixes. - Added soft good (goods that don't require shipping) handling capacity. - And more..